104urn:lsid:arphahub.com:pub:f2cd1fff-21e4-581f-a7fa-850997197b7furn:lsid:zoobank.org:pub:B1C81912-2D17-4CD8-8D2C-EFEAAAB2EF75Vertebrate ZoologyVZ1864-57552625-8498Senckenberg Gesellschaft für Naturforschung10.3897/vz.73.e103534103534Research ArticleAmphibiaAnuraAromobatidaeTaxonomyA new pale-ventered nurse frog (Aromobatidae: Allobates) from southwestern Brazilian AmazoniaSouzaJesus R. D.https://orcid.org/0000-0002-8384-329412FerrãoMiquéiasuranoscodon@gmail.comhttps://orcid.org/0000-0001-7035-827613KaeferIgor Luishttps://orcid.org/0000-0001-6515-02781Cunha-MachadoAntonio Saulo4Melo-SampaioPaulo Robertohttps://orcid.org/0000-0003-1858-16435HankenJameshttps://orcid.org/0000-0003-2782-96713LimaAlbertina Pimentelhttps://orcid.org/0000-0003-4586-56334Programa de Pós-Graduação em Zoologia, Universidade Federal do Amazonas, Manaus, Amazonas, BrazilUniversidade Federal do AmazonasManausBrazilInstituto de Meio Ambiente do Acre, Rio Branco, Acre, BrazilInstituto de Meio Ambiente do AcreRio BrancoBrazilMuseum of Comparative Zoology, Harvard University, Cambridge, Massachusetts, United States of AmericaHarvard UniversityCambridgeUnited States of AmericaCoordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia, Manaus, Amazonas, BrazilInstituto Nacional de Pesquisas da AmazôniaManausBrazilDepartamento de Vertebrados, Museu Nacional, Rio de Janeiro, Rio de Janeiro, BrazilMuseu NacionalRio de JaneiroBrazil
202321072023736476759F840398-0923-5A3B-9282-423635F13EFFD1F9510F-919B-43F1-AEE4-1B8b6C1113D91503202305062023Jesus R. D. Souza, Miquéias Ferrão, Igor Luis Kaefer, Antonio Saulo Cunha-Machado, Paulo Roberto Melo-Sampaio, James Hanken, Albertina Pimentel LimaThis is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.http://zoobank.org/D1F9510F-919B-43F1-AEE4-1B8b6C1113D9
Abstract
We use integrative taxonomy to formally describe a candidate species of nurse frog of the genus Allobates from southwestern Brazilian Amazonia. The new species nests within a clade that has been defined historically as A.gasconi, but it has an 8.8–11.0% genetic distance for 16S to samples from the type locality of A.gasconi. The new species differs from congeners mainly by males having a translucent white throat and vocal sac; advertisement calls with a duration of 42–60 ms, two notes separated by an inter-note interval of 8–23 ms, and a dominant frequency of 4,953–6,331 Hz; and exotrophic tadpoles with 2 pyramidal papillae on each end of the upper lip and 10–13 pyramidal and cylindrical papillae surrounding the lower lip. Phylogenetic analyses based on mitochondrial DNA suggest that A.gasconi sensu lato as defined previously represents a complex of as many as seven species, corroborating studies that have shown high levels of cryptic diversity within Allobates.
Advertisement callbiodiversityintegrative taxonomymorphologyphylogenyreproductive behaviorState of AcretadpoleHarvard Museum of Comparative Zoology, Brazilian National Council for Scientific and Technological Development (CNPq),Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), David Rockefeller Center for Latin American Studies (DRCLAS)
Citation
Souza JRD, Ferrão M, Kaefer IL, Cunha-Machado AS, Melo-Sampaio PR, Hanken J, Lima AP (2023) A new pale-ventered nurse frog (Aromobatidae: Allobates) from southwestern Brazilian Amazonia. Vertebrate Zoology 73 647–675. https://doi.org/10.3897/vz.73.e103534
Introduction
Nurse frogs of the genus Allobates Zimmermann & Zimmermann, 1988 are leaf-litter inhabitants of neotropical forests distributed from Central America to the east coast of South America (Grant et al. 2006, 2017; Frost 2023). Diverse reproductive behavior among species is associated with several different reproductive modes (sensu Nunes-de-Almeida et al. 2021), with most species depositing eggs on leaf-litter (e.g., A.caldwellae and A.tapajos; Lima et al. 2015, 2020) but others depositing them on the adaxial (e.g., A.carajas and A.velocicantus; Simões et al. 2019; Souza et al. 2020) or abaxial (e.g., A.subfolionidificans; Lima et al. 2007) surface of live leaves of small shrubs. Clutch size varies among species, as does coloration of eggs and the surrounding jelly (Lima et al. 2020). Parental care is common to all Allobates; species with exotrophic, free-swimming tadpoles exhibit clutch care and tadpole transport (e.g., A.femoralis), while species with endotrophic terrestrial tadpoles exhibit only clutch care (e.g., A.nidicola, A.masniger; Caldwell and Lima 2003).
Advertisement calls may be classified into two main types following the note-centered approach (sensu Köhler et al. 2017): Those with two or more notes (e.g., A.flaviventris and A.trilineatus; Melo-Sampaio et al. 2013; Jaramillo et al. 2021) and those with a single note (e.g., A.nidicola and A.paleovarzensis; Caldwell and Lima 2003; Lima et al. 2010). Most species are cryptically colored and exhibit little morphological divergence, which contrasts sharply with extensive genetic, behavioral and bioacoustic divergence that characterizes most interspecific comparisons (Kaefer et al. 2013; Maia et al. 2017; Fernandes et al. 2021).
The recent increase in the understanding of taxonomic diversity of Allobates is impressive: at least thirteen species have been described in just the last five years (Melo-Sampaio et al. 2018, 2020; Simões et al. 2018, 2019; Moraes et al. 2019; Lima et al. 2020; Souza et al. 2020; Gagliardi-Urrutia et al. 2021; Moraes and Lima 2021; Silva et al. 2022; Ferrão et al. 2022; Fouquet et al. 2023). This trend may be attributed to the increased sampling of remote areas of Amazonia and to the use of integrative taxonomy (e.g., Simões et al. 2018, 2019; Lima et al. 2020; Souza et al. 2020; Silva et al. 2022). These advances in alpha taxonomy and sampling coverage have led to new biogeographic hypotheses about the origin and diversification of this diverse genus (e.g., Réjaud et al. 2020). Nevertheless, many studies have concluded that species diversity in Allobates remains underestimated and that, in particular, some widely distributed species (e.g., A.gasconi, A.granti, A.tapajos, A.tinae and A.trilineatus) likely represent complexes of multiple species, each with a more restricted geographic distribution (Lima et al. 2020; Vacher et al. 2020; Jaramillo et al. 2021; Ferrão et al. 2022; Fouquet et al. 2023).
Allobatesgasconi was described based on the morphology of 33 individuals from five localities along both banks of the Juruá River, southwestern Brazilian Amazonia (Morales 2002). Several subsequent studies published genetic sequences tentatively identified as A.gasconi. Grant et al. (2006) published the first phylogenetic inference that included A.gasconi, based on individuals collected from the Ituxi River, an eastern tributary of the upper Purus River and ~400 km from the type locality in the Juruá River. Santos et al. (2009) subsequently applied the name A.gasconi to individuals from Porto Walter in the upper Juruá River (Acre, Brazil), which were recently assigned to A.trilineatus (Melo-Sampaio et al. 2018). Lima et al. (2014) sequenced individuals from the middle Juruá River (Eirunepé, Amazonas, Brazil) and identified them as A.gasconi. Melo-Sampaio et al. (2018) compiled these molecular data, corrected misidentifications and sequenced new samples from several localities in the upper Juruá and Purus basins (Acre and Amazonas, Brazil), recovering three deeply diverging mtDNA lineages within A.gasconi sensu lato. More recently, Vacher et al. (2020) sequenced new individuals of A.gasconi from the upper Madeira River (Rondônia, Brazil) and showed the existence of at least three highly distinct mtDNA lineages. However, their analysis did not include the newly sequenced individuals reported by Melo-Sampaio et al. (2018) from Acre. Réjaud et al. (2020) delimited all these lineages as a single species and recovered it as a member of the A.caeruleodactylus clade. Recently, Ferreira et al. (2023) redescribed A.gasconi based on fresh material from type and paratype localities and showed that none of those individuals identified as A.gasconi in earlier studies indeed represents A.gasconi sensu stricto. Moreover, Ferreira et al. (2023) highlighted that A.gasconi sensu lato comprises at least three candidate species and that none is closely related phylogenetically to A.gasconi sensu stricto.
We recently surveyed multiple localities in southwestern Amazonia (Acre, Brazil). Among the material collected are several individuals of Allobatesgasconi sensu lato that nest within a previously reported lineage by Melo-Sampaio et al. (2018) and Ferreira et al. (2023). In this study, we describe them as a new species based on morphological, bioacoustic, and molecular data, as well as their breeding behavior.
Materials and methodsSampling
Adult individuals were collected between November 2018 and February 2020 from five localities in southwestern Brazilian Amazonia—four in the State of Acre (forest fragment near the BR 364 highway, municipality of Manoel Urbano [8°52’27”S, 69°17’07”W, 166 meters above sea level—hereafter m asl]; east bank of the Antimary River, municipality of Bujari [09°29’16”S, 68°21’20”W, 168 m asl]; Parque Ambiental Chico Mendes, municipality of Rio Branco [10°02’13”S, 67°47’36”W, 158 m asl]; and municipality of Feijó [08°14’13”S, 70°22’44”W, 184 m asl]) and a fifth in the State of Amazonas (Reserva Extrativista Arapixi, municipality of Boca do Acre [08°58’21”S, 67°51’50”W, 125 m asl]). Ten tadpoles (INPAH45066) were taken from the dorsum of a male (INPAH45045) collected in Manoel Urbano on January 18, 2020; 18 eggs were taken from a freshly laid spawn (field number APL21511b) on January 7, 2020.
Tadpoles and eggs were reared in the laboratory until they reached Gosner (1960) developmental stages 33–37. Adults were killed with 2% aqueous benzocaine, fixed in 10% neutral-buffered formalin (NBF), and preserved in 70% ethanol. Tadpoles were killed with 2% aqueous benzocaine diluted in water and fixed in 10% NBF. Tissue samples for genetic analysis were removed before fixation and stored in 95% ethanol. Adults and tadpoles are deposited in herpetological collections at the Museu de Ciências e Tecnologia da Pontifícia Universidade Católica do Rio Grande do Sul (MCP; Porto Alegre, Brazil), Instituto Nacional de Pesquisas da Amazônia (INPAH; Manaus, Brazil), Museu Nacional (MNRJ; Rio de Janeiro, Brazil) and Museu Paraense Emílio Goeldi (MPEG; Belém, Brazil).
Advertisement calls of 17 males were recorded: eight from Manoel Urbano, two from Antimary River, three from Parque Ambiental Chico Mendes, one from Feijó and three from Reserva Extrativista Arapixi. Recordings were made between 0630 and 1100 h and between 1500 and 1730 h using a Sony PCM-D50 digital recorder with built-in microphone, a CSR Yoga HT-81 Shotgun directional microphone attached to a Zoom H4n recorder, and a Sennheiser ME 66 unidirectional microphone attached to a Marantz PMD661 digital recorder. Microphones were positioned approximately 1 m from the focal male. Recordings were taken at 16-bit resolution and 44.1 kHz and stored in WAV format. Air temperature recorded at the time of recordings ranged from 21 to 29°C. Recordings are deposited in the Fonoteca Neotropical Jacques Vielliard (FNJV 53680–93), UNICAMP, Campinas, Brazil.
Sequencing and phylogenetic analysis
Total genomic DNA was extracted from tissue samples of five individuals of the new species from Manoel Urbano, two from Antimary River and two from Parque Ambiental Chico Mendes (Rio Branco). DNA extractions were obtained using the commercial kit Wizard (Promega Corp., Madison, WI, USA) following manufacturer’s instructions. Fragments of the 16S rRNA mitochondrial gene were amplified by polymerase chain reaction (PCR) using the universal primers 16sar (CGCCTGTTTATCAAAAACAT) and 16sbr (CCGGTCTGAACTCAGATCACGT; Palumbi 1996). The PCR with final volume of 15 μL contained 6.4 μL distilled and deionized water; 1.5 μL MgCl (25 mM); 1.5 μL Tris-HCl buffer (10 mM); 1.5 μL dNTPs (25 mM); 1.5 μL 16sar primer at 2 pmol/μL; 1.5 μL 16sbr primer at 2 pmol/μL; 0.1 μL taq DNA polymerase (5 U/μL); and 1 uL DNA (10 ng/μL). The following thermocycling process was used for amplifying the reaction: 92°C for 30 s for the initial denaturation, 35 cycles of denaturation at a temperature of 92°C for 10 s, annealing at 50°C for 35 s, and extension at 72°C for 90 s; the final extension was performed at 72°C for 10 min. PCR products were purified with PEG (polyethylene glycol) 8000 and sequenced using the Big Dye Terminator Kit (Applied Biosystems, Waltham, USA) in an automated sequencer ABI Prism 3130 (ThermoFisher Scientific, Waltham, USA). Sequences were visually checked and manually edited in GENEIOUS 5.3.4 (Kearse et al. 2012). Newly generated sequences are deposited in GenBank (http://www.ncbi.nlm.nih.gov/Genbank) under accession numbers ON937745–53.
Sequences of the 16S fragment and four additional genes (12S ribosomal RNA [12S], cytochrome c oxidase I [COI], cytochrome B [cyt b] and NADH dehydrogenase 1 [ND1]) were retrieved from GenBank to infer the phylogenetic relationship of the new species, including sequences of five individuals of the new species previously reported as A.gasconi by Melo-Sampaio et al. (2018). Sequences of Ameerega Bauer, 1986, AnomaloglossusGrant et al., 2006, Aromobates Myers et al., 1991, Colostethus Cope, 1866, Dendrobates Wagler, 1830, LeucostethusGrant et al., 2017, Mannophryne La Marca, 1992, Phyllobates Bibron, 1840, RheobatesGrant et al., 2006 and SilverstoneiaGrant et al., 2006 were used as outgroups. The final dataset combined 104 sequences of 16S, 60 of 12S, 50 of COI, 64 of cyt b and 41 of ND1. Sequences were aligned separately for each gene with the online implementation of the MAFFT algorithm (https://mafft.cbrc.jp) using the E-INS-i strategy for RNA genes and G–INS–i for the protein-coding genes (Katoh and Standley 2013). MESQUITE 3.04 (Maddison and Maddison 2015) was used to concatenate alignments and generate the final matrix, which is composed of 6,251 base-pairs and 104 terminals. Appendix 1 lists vouchers and GenBank accession numbers for the entire dataset.
The final matrix was split into 10 partitions, one for RNA genes (12S plus 16S) and one for each codon of protein-coding genes (COI, cyt b and ND1). The following best-fit partitioning scheme and nucleotide models were inferred with MODELFINDER (Kalyaanamoorthy et al. 2017) implemented in IQ-TREE (Nguyen et al. 2015): GTR+F+R6 for 12S+16S, SYM+I+G4 for cyt b 1st codon plus ND1 1st codon, TIM+F+I+G4 for cyt b 2nd codon plus ND1 2nd codon plus COI 2nd codon, TN+F+R5 for cyt b 3rd codon plus ND1 3rd codon plus COI 3rd codon, and TIM3e+I+G4 for COI 1st codon. Phylogenetic relationship was inferred through Maximum Likelihood inference using IQ-TREE. Node support was calculated using 10,000 ultrafast bootstrap approximation replicates (Hoang et al. 2018) with a maximum 10,000 iterations (unsuccessful iterations to stop > 100), a 0.99 minimum correlation coefficient and 10,000 replicates of the Shimodaira-Hasegawa approximate likelihood ratio test (SH-aLRT). Uncorrected (p) and Kimura-2-parameter (K2p) distances (Kimura 1980) between the new species and other nurse frogs were calculated with MEGA 11 (Tamura et al. 2021).
Molecular species delimitation
We conducted three molecular species delimitation analyses to delimit putative species: Generalized Mixed Yule Coalescent (GMYC; Pons et al. 2006; Fujisawa and Barraclough 2013), Assemble Species by Automatic Partitioning (ASAP; Puillandre et al. 2021) and Automatic Barcode Gap Discovery (ABGD; Puillandre et al. 2012). GMYC delimits putative species by optimizing the set of nodes that define the transitions between inter- and intra-specific processes through speciation (Yule 1925) and neutral coalescent (Hudson 1990) models (Pons et al. 2006; Fujisawa and Barraclough 2013). ASAP and ABGD are clustering algorithms that implement pairwise genetic distances (Jukes-Cantor, K2P or p distances) to estimate multiple potential barcode gaps and define minimum distance thresholds to partition samples into putative species. The main difference between them is that the best partition is selected through a score system in ASAP, while in ABGD this selection is unsupervised and based on prior knowledge regarding interspecific genetic distance thresholds. As delimitations may differ between methods, a lineage was considered a candidate species if it was supported by at least two methods (majority rule consensus).
Molecular species delimitation analyses were conducted with the complete 16S alignment, which include all other species of Allobates included in previous phylogenetic analyses. GMYC requires a single-locus ultrametric phylogenetic tree as input, therefore a 16S tree was inferred through Bayesian Inference in BEAST 2.6.3 (Bouckaert et al. 2019) using a relaxed log-normal clock model and Yule Process tree prior; a run of 100 million generations was sampled every 10,000 steps. Stationarity and effective sample size (> 200) of posterior distributions and priors were checked in TRACER v1.7.1 (Rambaut et al. 2018). The Maximum Clade Credibility (MCC) tree was annotated using TREEANOTATOR v.2.6.3 (Bouckaert et al. 2019) after burn-in of 40%. The GMYC was run in the webserver https://species.h-its.org/gmyc using the single threshold. ASAP was run in the webserver https://bioinfo.mnhn.fr/abi/public/asap using p distances as the substitution model and default parameters. ABGD was run in the webserver https://bioinfo.mnhn.fr/abi/public/abgd using p distances as the sequence substitution model, minimum intraspecific pairwise distance = 0.001 and maximum = 0.1, 10 iterative steps, and relative gap width (X) = 1. ASAP and ABGD were run with the 16S alignment.
Morphological characters
Sex was determined by the presence of a vocal sac or direct observation of vocal activity in males, and by the presence of eggs (visible through belly skin) in females. The following linear measurements, taken using a digital calipers (precision 0.01 mm) or a stereomicroscope (precision greater than 0.1 mm), follow Lima et al. (2007): Snout-vent length (SVL); head length (HL); interorbital distance (IO); head width (HW); snout length (SL); eye-nostril distance (END); inter-nostril distance (IND); eye length (EL); tympanic diameter (TYM); forearm length (FAL); upper arm length (UAL); thigh length (THL); tibia length (TIL); foot length (FL); hand length from the proximal edge of the palmar tubercle to the tip of finger I (HANDI), finger II (HANDII), finger III (HANDIII) and finger IV (HANDIV); width of finger III disc (WFD); palmar tubercle diameter (DPT); width of thenar tubercle (WTT); width of finger III at proximal phalanx (WPF); and width of toe IV disc (WTD). Terminology and morphological characters follow Grant et al. (2017), except for finger numbering (I–IV). Character states of swelling on finger III follow Cavalcanti et al. (2022). Morphological descriptions follow Souza et al. (2020). Coloration is described from photographs and fieldnotes. Coloration is described from photos of formalin-fixed specimens. Morphometric measurements are listed in Table S1.
Developmental stage was scored according to Gosner (1960). Twelve tadpoles were measured from lot INPAH45066, all at stages 34–37. The following linear measurements, taken with a micrometer coupled to a stereomicroscope, follow Altig and McDiarmid (1999), Schulze et al. (2015) and Randrianiaina et al. (2011): Total length (TL); body length (BL); tail length (TAL); body width (BW); body height (BH); head width (HWLE); tail muscle width (TMW); maximum tail height (MTH); tail muscle height (TMH); interorbital distance (IOD); inter-nostril distance (IND); eye-nostril distance (END); nostril-snout distance (NSD); eye diameter (ED); vent-tube length (VTL); spiracle-tube length (STL); snout-spiracle distance (SS); oral-disc width (ODW); size of the anterior gap of marginal papillae (DG); upper jaw width (UJW); upper jaw length (UJL); posterior (PL) and anterior (AL) labium length; width of the first (A1) and second (A2) anterior keratodont row; and width of the first (P1), second (P2) and third (P3) posterior keratodont rows. Terminology and diagnostic characters follow Altig and McDiarmid (1999) and Schulze et al. (2015). Characterization of body shape follows Dubeux et al. (2020). Morphological descriptions are based on six tadpoles at stage 34 and follow Schulze et al. (2015). Coloration is described from photos of formalin-fixed specimens. Morphometric measurements are listed in Table S2.
Morphological analysis
Ferreira et al. (2023) show that Allobatesgasconi sensu stricto and the new species (as A.gasconi SL4) are not closely related. However, they have been misidentified historically. Due to that, we also took the above morphometric measurements from topotypic adults of A.gasconi recently collected by Ferreira et al. (2023) to allow direct comparisons between them and adults of the new species. The type series of A.gasconi is considerably dehydrated (Ferreira et al. 2023). To avoid biasing the statistical analysis with potentially confounding data, we did not use type specimens.
Although body size may be informative in some interspecific pair-wise comparisons, statistical artifacts are eventually associated with the use of raw body ratios (all measurements against SVL) in standard Principal Component Analysis (PCA), thus we ran an adapted PCA called Shape PCA (Baur and Leuenberger 2011). Briefly, raw morphometric measurements are first log-transformed and then standardized using log-mean of each variable to avoid nonlinearity issues. Then, size and shape algorithms are implemented to allow the interpretation of principal components (PC) in terms of body shape and isometric size (isosize). Isosize is the geometric mean of all morphometric measurements of an individual (Baur and Leuenberger 2011). Shape PCA was run separately for males and females using the R script available at Zenodo (DOI: 10.5281/zenodo.3890195; Baur and Leuenberger 2020). To test if body shape and isosize of A.gasconi sensu stricto differ statistically from those of the new species, one-way analysis of variance (one-way ANOVA) was run separately for shape PC1, shape PC2 and isosize, setting them as response variables and species as factors. Statistical significance was calculated through Tukey’s test using α = 0.05. Morphometric measurements of both species are available at Table S1.
Presence of sexual dimorphism in SVL and 22 morphometric ratios of the new species was evaluated with one-way ANOVAs through the function aov of the package stats (R Core Team 2021). Homogeneity of variances was checked visually with Residuals vs. Fitted values Plot and tested with Levene test using the function leveneTest of the car package (Fox and Weisberg 2019). Normality of residuals was inspected with Normal Q-Q plots and tested with the Shapiro-Wilk test through the function shapiro.test of the stats package. Outliers were excluded from analyses to fit homogeneity and normality assumptions. Multiple comparisons adjustment of p values was calculated using Benjamini and Hochberg correction (Benjamini and Hochberg 1995) through the function p.adjust of the package stats.
Bioacoustic analysis
Terminology used to describe the advertisement call of the new species follows the note-centered approach (Köhler et al. 2017). The following spectral and temporal parameters were measured from ten calls of 17 males: call duration (CD), inter-call interval (ICI), call-series duration (CSD), inter-call-series interval (ICSI), note duration measured in the first (ND1) and second (ND2) notes, inter-note interval (INI), lower (LFN1, LFN2), upper (HFN1, HFN2) and dominant (DFN1, DFN2) frequency of the first and second notes, respectively. All recordings were visually inspected to count the proportion of each call arrangement in the vocalization of the new species. Acoustic analyses were performed in Raven pro 1.5 (Bioacoustics Research Program 2015) set as follows: window = Blackman, Discrete Fourier Transform = 2,048 samples and 3 dB filter bandwidth = 80.0 Hz. Dominant frequency was measured using the Peak frequency function; upper and lower frequencies were measured 20 dB below the peak frequency to avoid background noise interference. Graphical representation of calls was generated in R using the Seewave package (Sueur et al. 2008) configured as follows: Hanning window, overlap of 85% and 256 points of resolution (FFT).
Breeding behavior
Notes on reproductive behavior were obtained from observation of four courtship events that occurred between 0600 and 0900 h: one in Manoel Urbano on February 7, 2020; the other three in Parque Ambiental Chico Mendes on February 12, 14 and 15, 2020. The courting male INPAH45044 and female INPAH45050 were collected; both are included in the type series.
Interspecific comparisons
The new species has been found only in the upper Juruá and Purus basins, southwestern Brazilian Amazonia. Since most Allobates have restricted geographic distributions when compared to species in other genera, interspecific comparisons here are limited to cryptically colored species known to be distributed in the southwestern Amazonian lowlands of Bolivia, Brazil and Peru (Appendix 2): A.conspicuus (Morales, 2002); A.flaviventris Melo-Sampaio, Souza & Peloso, 2013; A.fuscellus (Morales, 2002); A.gasconi (Morales, 2002); A.kamilae Ferrão, Hanken & Lima, 2022; A.melanolaemus (Grant & Rodríguez, 2001); A.nidicola (Caldwell & Lima, 2003); A.ornatus (Morales, 2002); A.pacaasMelo-Sampaio et al., 2020; A.paleovarzensis Lima, Caldwell, Biavati & Montanarin, 2010; A.sieggreenaeGagliardi-Urrutia et al., 2021; A.subfolionidificans (Lima, Sanchez & Souza, 2007); A.tinae Melo-Sampaio, Oliveira & Prates, 2018; A.trilineatus (Boulenger, 1884); A.vanzolinius (Morales, 2002); and A.velocicantus Souza, Ferrão, Hanken & Lima, 2020. In addition, we make comparisons to species of the A.caeruleodactylus clade (sensu Réjaud et al. 2020): A.caeruleodactylus Lima & Caldwell, 2001; A.grillisimilis Simões, Sturaro, Peloso & Lima, 2013a; A.grillicantus Moraes & Lima, 2021; A.paleci Silva, Marques, Folly & Santana, 2022; and A.tapajos Lima, Simões & Kaefer, 2015. Corresponding type localities are plotted in Fig. 1.
The topology of our molecular phylogeny is consistent with that recovered in the most recently published phylogeny of Allobates (Réjaud et al. 2020), particularly with respect to the relationships among major clades (Figure S1). Three major clades compose the A.caeruleodactylus clade (Fig. 2): one grouping A.caeruleodactylus, A.grillicantus and A.grillisimilis; another one nesting members of the A.tapajos species complex; and the last one grouping species previously misidentified with A.gasconi. The last two clades are recovered as sisters with high support. The new species (A.albiventrissp. nov.) nests within the species complex that groups species previously misidentified as Allobatesgasconi, which is called A.albiventris species complex hereafter. See Appendix 3 for geographic distribution of the A.albiventris species complex.
Phylogeny of Allobates based on five mitochondrial genes (12S, 16S, COI, cyt b and ND1), focusing on relationships within the Allobatescaeruleodactylus clade. Node support was calculated following 10,000 ultrafast bootstrap approximation replicates and 10,000 replicates of the SH-aLRT branch test. Vertical bars represent species delimited with 16S through Automatic Barcode Gap Discovery (ABGD), Assemble Species by Automatic Partitioning (ASAP) and Generalized Mixed Yule Coalescent (GMYC) methods. The phylogenetic tree inset at lower left indicates the location of the A.caeruleodactylus clade in the overall Allobates phylogeny (Supplemental Figure 1). Red star in the compressed phylogeny represents A.gasconi sensu stricto. Note that individuals of A.albiventrissp. nov. and A.aff.albiventris were reported as A.gasconi in previous studies.
https://binary.pensoft.net/fig/881721
Within the species complex that groups species previously misidentified as Allobatesgasconi, newly sequenced individuals of the new species (A.albiventrissp. nov.) cluster together in a highly supported group with individuals from Feijó, Reserva Extrativista (RE) Arapixi and Parque Ambiental (PA) Chico Mendes (Acre and Amazonas, Brazil) reported by Melo-Sampaio et al. (2018). This clade is retrieved with high support as sister to A.aff.albiventris SL5 from Ituxi River and Boca do Acre, which is followed by A.aff.albiventris SL3 from the Madeira River, A.aff.albiventris SL2 from the lower Juruá River and finally A.aff.albiventris SL1 from the middle Juruá River (Fig. 2).
Interspecific pairwise p distances within the Allobatesalbiventris species complex range from 1.2 to 4.8% (Table 1). The two smallest distances are between the new species (Allobatesalbiventrissp. nov.) and A.aff.albiventris SL3 (1.9%; 1.6–2.1%) and between the new species and A.aff.albiventris SL5 (2.0%; 1.2–2.4%). Although samples of the new species are widely distributed across the Brazilian State of Acre, genetic p distances between newly sequenced individuals of the new species and those reported by Melo-Sampaio et al. (2018) are very low (0.2%; 0.0–0.4%). The small genotypic divergence is congruent with low levels of phenotypic and bioacoustic divergence observed within the new species (see below).
Pairwise genetic distances between and within Allobatesgasconi sensu stricto (SS) and species of the Allobatesalbiventris species complex based on a fragment of 16S rRNA. Uncorrected pairwise distances (p distance) and Kimura 2-parameter distances (K2P) are below and above the diagonal, respectively. Numbers in bold along the diagonal denote intraspecific p distances. Distances are expressed as percentage and presented as mean and range.
Species
1
2
3
4
5
6
1
A.gasconiSS
0.4 (0.0–0.9)
10.2 (9.0–12.1)
9.6 (8.8–11.0)
10.2 (9.0–11.8)
10.9 (9.5–12.3)
10.7 (9.3–12.6)
2
A.aff.albiventris SL1
9.5 (8.4–11.1)
0.1 (0.0–0.2)
3.1 (2.8–3.3)
4.8 (4.6–5.0)
4.1 (3.8–5.0)
4.5 (4.0–5.0)
3
A.aff.albiventris SL2
9.0 (8.3–10.1)
3.0 (2.8–3.2)
0.2 (0.0–0.6)
3.8 (3.7–4.1)
3.3 (2.8–4.3)
3.9 (3.5–4.4)
4
A.aff.albiventris SL3
9.5 (8.5–10.8)
4.6 (4.4–4.8)
3.7 (3.6–3.9)
0.2 (0.0–0.4)
1.9 (1.6–2.2)
2.3 (1.7–2.9)
5
A.albiventrissp. nov.
10.0 (8.8–11.0)
4.0 (3.8–4.8)
3.2 (2.9–4.1)
1.9 (1.6–2.1)
0.2 (0.0–0.4)
2.0 (1.2–2.5)
6
A.aff.albiventris SL5
9.9 (8.7–11.4)
4.3 (3.8–4.8)
3.7 (3.4–4.2)
2.2 (1.7–2.8)
2.0 (1.2–2.4)
0.6 (0.0–1.6)
Single-locus DNA delimitation
The best-ranked partition computed by ASAP (score = 3.5; p = 0.001; w = 0.0006) delimits all five clades within the species complex as distinct species (Fig. 2). The best ASAP threshold distance for the 16S dataset in this partition is 1%. As expected, the delimitation resulting from ABGD resembles that of ASAP and delimits the same five species (Fig. 2). On the other hand, GMYC is less conservative and delimits seven species by splitting the new species and A.aff.albiventris SL5 into two species each (Fig. 2). The majority rule consensus of these single-locus delimitation methods supports the delimitation of five species in the Allobatesalbiventris species complex.
Morphological analyses
The first two principal components of the Shape PCA performed with 23 morphometric measurements of A.gasconi sensu stricto and the new species together explain 64.6% and 63.1% of the variance of males and females, respectively (Table 2). Although the two respective shape spaces do not overlap in graphical representations of shape PC1 against PC2 (Fig. 3A, C), body shape is statistically different only in shape PC1 (ANOVAs: male, S2 = 2.7, F = 221.5, df = 44, p < .0001; female, S2 = 2.2, F = 142.2, df = 22, p < .0001). Width of finger III (WPF), eye–nostril distance (EN) and snout length (SL) strongly contribute to the variation of shape PC1 of both males and females (Table 2). The new species and A.gasconi sensu stricto also differ in the isometric size of males (ANOVA: S2 = 0.01, F = 8.3, df = 44, p = 0.006), with the new species being larger (Fig. 3B).
Shape Principal Component Analysis and isometric size of Allobatesgasconi sensu stricto and A.albiventrissp. nov.. Analyses are based on 23 morphometric measurements of 28 males (A, B) and 22 females (C, D). Abbreviation: s.s., sensu stricto.
https://binary.pensoft.net/fig/881722
Loadings of morphometric variables on the first two shape principal components (PC) based on 28 male and 22 female Allobatesgasconi sensu stricto and Allobatesalbiventrissp. nov. Numbers in bold denote variables that make the highest contributions to each shape PC. Measurement acronyms are described in the text; n, sample size.
Allobatesgasconi – Melo-Sampaio et al. (2018), Lima et al. (2020), Gagliardi-Urrutia et al. (2021), Jaramillo et al. (2021), Silva et al. (2022). Allobatesgasconi C – Souza et al. (2020). Allobatesgasconi SL4 – Ferreira et al. (2023).
Holotype.
INPAH45035 (field number APL21526), an adult male collected by J.R.D. Souza on February 5, 2020, in a forest fragment near BR 364 (08°52’27”S, 69°17’07”W, 166 m asl), municipality of Manoel Urbano, State of Acre, Brazil.
Paratopotypes.
Nineteen adult specimens collected by J.R.D. Souza and A.P. Lima at the same locality as the holotype: 13 males INPAH45036–40 (field numbers APL21371–75), INPAH45042–47 (field numbers 21479–80, 21511, 21518, 21525 and 21528, respectively) and MPEG44609–10 (field numbers APL21370 and 21380, respectively), and six females INPAH45048–51 (field numbers APL21476, 21481, 21512 and 21527, respectively) and MPEG44611–12 (field numbers APL21478 and 21515, respectively).
Paratypes.
Twenty-three adult specimens collected between 2018 and 2020 by J.R.D. Souza in the State of Acre, and between 2015 and 2016 by P.R. Melo-Sampaio in the States of Acre and Amazonas. ACRE: 10 females MPEG44607 (field number APL21355), INPAH45052–59 (field numbers APL21357, 21523–24 and 21530–34, respectively) and MPEG44613 (field number APL21522) and 7 males INPAH45060–63 (field numbers APL21520–21, 21354 and 21356, respectively), MPEG44608 (field number APL21358), MPEG44606 (field number APL21352) and MNRJ91679 (GenBank KY886578) from Parque Ambiental Chico Mendes (10°02’13”S, 67°47’36”W, 158 m asl), municipality of Rio Branco; and 2 males INPAH45064–65 (field numbers APL21350–51, respectively) collected near the bank of the Antimary River (09°29’16”S, 68°21’20”W, 168 m asl.); one female MNRJ91665 (GenBank KY886576) and one male MCP13630 (GenBank KY886577) from the municipality of Feijó (08°14’13”S, 70°22’44”W, 184 m asl). AMAZONAS: one male MNRJ91683 (GenBank KY886574) and one female MNRJ91684 (GenBank KY886575) from Reserva Extrativista Arapixi (08°58’21”S, 67°51’50”W, 125 m asl), municipality of Boca do Acre.
Referred specimen.
Brazil: Acre, one male (PRMS0360) collected by P.R. Melo-Sampaio on January 25, 2016, in Reserva Extrativista Arapixi, municipality of Boca do Acre.
Etymology.
The specific epithet albiventris is a combination of two Latin words, albus (white) and ventris (venter), in reference to the pale ventral coloration of the new species. Vernacular names: pale-ventered nurse frog (English), rana cuidadora de vientre blanco (Spanish), and rãzinha cuidadora de ventre branco (Portuguese).
Generic placement.
The new species is allocated to the genus Allobates based on molecular phylogenetic analysis and phenotypic characters proposed by Grant et al. (2017): paired dorsal digital scutes (character 2), tip of finger IV reaches the distal half of distal subarticular tubercle of finger III (character 5), finger III swollen in adult males (character 21), toe IV with basal webbing and lateral fringe on its preaxial side (characters 43), pale paracloacal marks (character 50) and absence of median lingual process (character 85).
Definition.
Allobatesalbiventrissp. nov. is characterized by small adult size, SVL 14.3–16.4 mm (n = 22) in males and 15.6–17.8 mm (n = 16) in females. Dorsum smooth with a high concentration of granules in the medium posterior portion. Snout semi-truncated and semi-acuminate in dorsal and lateral views; canthusrostralis almost straight in dorsal view; loreal region flat; nostrils visible in ventral and lateral views. Tympanum diameter 34–48% of EL. Maxillary teeth present, visible under magnification; median lingual process absent. One subarticular tubercle on finger IV; fingers II and III weakly swollen in adult males; disc on finger II approximately the same width as distal phalanx; width of discs on fingers I, III and IV represent 1.3±0.3, 1.5±0.2 and 1.6±0.2 of width of respective distal phalanges; tip of finger IV reaches the distal subarticular tubercle of finger III; nuptial excrescence on thumb absent; lateral keels present on fingers II–IV; supernumerary tubercles and metacarpal ridge absent; webbing absent between fingers; black gland absent on arm; tarsal keel present, tubercle-like, strongly curved towards the inner metatarsal tubercle; basal webbing present between toes II–IV, less developed between toes II and III; discs on toes II–V moderately expanded; disc on toe I not expanded, approximately the same width of distal phalanx; lateral keels present on all toes. Dorsum light brown with a dark brown band, diamond or hourglass-shaped marks; pale dorsolateral stripe present in preserved specimens, with an irregular upper border extending from the posterior region of the eyelids to the posteromedial region of the body or urostyle; pale ventrolateral stripe absent in preservative, discontinued when present in living specimens; dark brown oblique lateral stripe present, narrower from snout to anterior corner of eye, wider from the posterior corner of the eye to the groin, with an irregular lower border. Paired dorsal digital scutes white. Cream-colored forelimbs with scattered dark brown spots and blotches. Hind limbs light brown; anterior and dorsal portions of the thigh with dark brown spots, dorsal region light brown with scattered spots; a dark brown transverse bar present on thigh of some individuals, usually on tibia; comma-shaped, light brown to orange paracloacal mark. In life, males and females have a white belly and chest without melanophores; throat and vocal sac of males translucent white with scattered melanophores; throat white centrally and posteriorly, translucent laterally and anteriorly in females, with scattered melanophores distributed in the anterior region of the maxilla. Unpigmented intestine. Dark brown mature oocyte; unpigmented testes. Advertisement call with a duration of 42–60 ms and comprising two notes (the first note is shorter than the second), with an inter-note interval of 8–23 ms and dominant frequency of 4,953–6,331 Hz. Exotrophic tadpoles with 2 pyramidal papillae on each end of the anterior labium; 10–13 pyramidal and cylindrical papillae on the posterior labium; LTRF = 2(2)/3(1); gap in row A-2 ≈ 40% of A-1; relative length P-1 > P-2 > P-3; and P-3 ≈ 65% of P-1.
Diagnosis.
Allobatesalbiventrissp. nov. differs from other Allobates by the following combination of characters: males in life with a throat and vocal sac translucent white with melanophores uniformly distributed and a white belly; females in life with throat white centrally and posteriorly, translucent laterally and anteriorly, chest and belly white; small adult size, SVL 14.3–16.4 mm (n = 22) in males and 15.6–17.8 mm (n = 16) in females; one subarticular tubercle on finger IV; finger III of adult males weakly swollen; disc of finger II approximately the same width as the distal phalanx; interdigital membranes present between toes II, III and IV; paired digital scutes white; advertisement call with a duration of 42–60 ms and comprising two notes (the first note is smaller than the second), with an inter-note interval of 8–23 ms and dominant frequency of 4,953–6,331 Hz; exotrophic tadpoles with 2 pyramidal papillae on each end of the anterior labium, 10–13 pyramidal and cylindrical papillae on the posterior labium, LTRF = 2(2)/3(1), gap in row A-2 ≈ 40% of A-1, relative length P-1 > P-2 > P-3, and P-3 ≈ 65% of P-1.
Comparisons.
Characteristics of the compared species are presented within parentheses unless stated otherwise. Males of Allobatesalbiventrissp. nov. are easily distinguished from those of A.flaviventris, A.fuscellus, A.grillicantus, A.kamilae, A.melanolaemus, A.nidicola, A.ornatus, A.paleci, A.paleovarzensis, A.tapajos, A.tinae, A.trilineatus, A.vanzolinius and A.velocicantus by having a translucent white throat and vocal sac in life (violaceous to gray in A.flaviventris, A.pacaas and A.paleovarzensis; yellow in A.grillicantus, A.kamilae, A.paleci, A.tapajos and A.tinae; gray to black in A.fuscellus, A.melanolaemus, A.nidicola, A.trilineatus and A.vanzolinius; gray in A.ornatus; whitish centrally and yellow laterally in A.velocicantus). Additionally, A.albiventrissp. nov. differs from A.pacaas by having only one subarticular tubercle on finger IV (two tubercles); from A.tapajos by the presence of melanophores on the vocal sac of males (absent); from A.flaviventris, A.nidicola, A.paleovarzensis and A.vanzolinius by having a maximum SVL of 16.4 mm in males (minimum SVL 16.7 mm in A.flaviventris, 18.5 mm in A.nidicola, 18.3 mm in A.paleovarzensis and 21.5 mm in A.vanzolinius).
Males of Allobatescaeruleodactylus, A.conspicuus, A.grillisimilis, A.subfolionidificans and A.sieggreenae have a throat and vocal sac coloration similar to A.albiventrissp. nov. However, A.albiventrissp. nov. differs from these species by the presence of dark marks or a dark brown, wide longitudinal band on the dorsum (uniform light brown dorsum in all mentioned species). In addition, A.albiventrissp. nov. differs from A.caeruleodactylus by having white digital scutes in life (blue); from A.conspicuus and A.sieggreenae by the absence of a continuous ventrolateral stripe (ventrolateral stripe present); from A.grillisimilis by having regularly distributed melanophores on the throat, vocal sac and chest (melanophores, when present, only on the jaw); and from A.subfolionidificans by having a dorsolateral stripe (absent) and females in life with a white chest and belly (yellow).
Although A.albiventrissp. nov. has been confused with A.gasconi, they are easily distinguished by the coloration of breeding adults. Males of the new species are easily distinguished from those of A.gasconi sensu stricto by the translucent white throat and vocal sac (gray to dark gray; Fig. 5), white chest (translucent to pinkish grey) and white belly without melanophores (belly pinkish grey anteriorly, whitish grey centrally, light or translucent grey with white and brown small blotches laterally, and yellowish or translucent grey posteriorly; Ferreira et al. 2023; present study). Female A.albiventrissp. nov. have a white throat centrally and posteriorly but translucent laterally and anteriorly (light to bright yellow), a white chest (bright to whitish yellow) and a white belly (belly yellowish to whitish cream). Moreover, finger III of adult males is only slightly swollen (moderately to highly swollen; Ferreira et al. 2023; present study).
The advertisement calls of Allobatesalbiventrissp. nov. differ from A.gasconi sensu stricto by a call duration of 50±4 ms (94±33 ms), exclusively composed of 2 notes (2–4 notes, mainly 3 notes) with the first note always shorter than the second (notes with similar duration) and an inter-note interval of 16±4 ms (30±4 ms; Ferreira et al. 2023). Calls of A.albiventrissp. nov. and A.trilineatus are similar: both are composed of two notes and are arranged in call series. However, the former species differs from A.trilineatus by having a call duration of 42–60 ms (60–80 ms) and the first note always shorter and with a lower dominant frequency than the second one (similar duration and dominant frequency in both notes; Jaramillo et al. 2021). Calls of A.albiventrissp. nov. have two notes exclusively, which differs from A.caeruleodactylus, A.melanolaemus, A.nidicola, A.paleovarzensis, A.sieggreenae, A.subfolionidificans, A.tapajos and A.tinae (calls composed of one note in each species). Moreover, calls of A.albiventrissp. nov. are commonly arranged in call series (single calls emitted regularly through time in A.caeruleodactylus, A.nidicola and A.subfolionidificans) with a call duration of 42–60 ms (151–507 ms in A.grillicantus; 122–305 ms in A.grillisimilis; 180–340 ms in A.paleci; and 1,870–2,890 ms in A.velocicantus) and are composed exclusively of two notes (3–15 notes in A.grillicantus and A.grillisimilis; 16–33 ms in A.paleci; and 66–138 in A.velocicantus). As in A.albiventrissp. nov., regular calls of A.flaviventris are composed of two notes, but in the former species calls are emitted with a dominant frequency of 4,953–6,331 Hz (3,618–4,651 Hz in A.flaviventris). The advertisement calls of A.conspicuus, A.fuscellus, A.ornatus, A.pacaas and A.vanzolinius are unknown.
Tadpoles of Allobatesalbiventrissp. nov. easily differ from those of A.gasconi sensu stricto by having a LTRF = 2(2)/3(1) and a tail highly pigmented with brown spots of various shapes and sizes resembling a marbled pattern (LTRF = 2(2)/2(1) and a tail poorly pigmented with brown spots; Ferreira et al. 2023); from those of A.nidicola by being exotrophic and having a spiracle (endotrophic, spiracle absent); from A.subfolionidificans and A.tapajos by having two pyramidal papillae on each side of the anterior labium (six in A.subfolionidificans; four or five in A.tapajos); from A.velocicantus by having pyramidal and cylindrical papillae on the posterior labium (only pyramidal in A.velocicantus); from A.grillicantus by having LTRF = 2(2)/3(1) [LTRF = 2(2)/3 in A.grillicantus]; from A.grillisimilis and A.paleovarzensis by having LTRF = P-1 > P-2 > P-3 (P-3 = P-2 = P-1 in A.grillisimilis; P-2 > P-1 > P-3 in A.paleovarzensis); from A.caeruleodactylus by the gap in row A-2 ≈ 40% of A-1 and P-3 ≈ 65% of P-1 (A-2 gap ≈ 58% of A-1 and P-3 ≈ 37% of P-1 in A.caeruleodactylus). Tadpoles of A.conspicuus, A.flaviventris, A.fuscellus, A.melanolaemus, A.ornatus, A.pacaas, A.tinae, A.sieggreenae, A.trilineatus and A.vanzolinius are unknown.
Description of the holotype.
Adult male, INPAH45035 (Figs 4A–C; 6A, C; 8A–C; Table 3). Snout-vent length 14.6 mm. Head wider than long (HW/HL = 1.04); HW equals 35% of SVL and HL equals 33% of SVL. Eye diameter exceeds distance from eye to nostril (EL/END = 1.33); EL equals 43% of HL. Interorbital region flat; IOD equals 88% of HW. Tympanum rounded, visible to the naked eye. Snout slightly rounded in dorsal and lateral view. Inter-nostril region flat; nostrils rounded, laterally positioned and visible in lateral and ventral view; IND equals 49% of IOD. Canthusrostralis straight in dorsal view; loreal region flat. Maxillary teeth present. Median lingual process absent. Vocal sac single, subgular. Lateral folds of vocal sac present at the level of angle of maxilla.
Dorsal, dorsolateral and ventral views of the male holotype INPAH45035 (A–C) and a female paratype INPAH45051 (D–F) of Allobatesalbiventrissp. nov. Scale bar: 5 mm. Photographs by J.R.D. Souza.
Coloration of the vocal sac and throat of Allobatesalbiventrissp. nov. (A, B) and A.gasconi sensu stricto (C, D). Photographs by J.R.D. Souza (A, B) and A.P. Lima (C, D).
Ventral view of the hand (A, B) and foot (C, D) of Allobatesalbiventrissp. nov. (A, C) Male holotype INPAH45035. (B, D) Female paratype INPAH45051. Scale bar: 0.5 mm (A, B) and 1 mm (C, D). Photographs by J.R.D. Souza.
https://binary.pensoft.net/fig/881725
Morphometric measurements in millimeters of Allobatesalbiventrissp. nov. and A.gasconi sensu stricto. Values represent mean ± standard deviation (range). Measurement acronyms are described in the text; n, sample size.
Allobatesalbiventris sp. nov.
Allobatesgasconi sensu stricto
Characters
Holotype
Males (n = 21)
Females (n = 16)
Males (n = 24)
Females (n = 7)
SVL
14.6
15.3±0.5 (14.3–16.4)
16.5±0.5 (15.6–17.8)
16.2±0.6 (14.8–17.1)
16.8±0.8 (16.0–18.0)
IOD
4.5
4.6±0.2 (4.3–5.0)
4.8±0.2 (4.5–5.1)
4.7±0.3 (4.3–5.5)
4.7±0.2 (4.3–4.9)
HW
5.1
5.1±0.2 (4.8–5.5)
5.5±0.2 (5.1–5.9)
4.9±0.3 (4.3–6.0)
4.9±0.2 (4.5–5.1)
HL
4.9
4.9±0.2 (4.6–5.4)
5.3±0.2 (4.9–5.8)
4.6±0.4 (4.0–5.7)
4.7±0.3 (4.3–4.9)
IND
2.2
2.2±0.1 (2.0–2.5)
2.4±0.1 (2.3–2.6)
2.4±0.1 (2.2–2.7)
2.5±0.1 (2.3–2.6)
THL
7.0
7.0±0.4 (6.4–8.0)
7.3±0.2 (7.0–7.9)
7.4±0.6 (6.5–8.8)
7.4±0.3 (7.0–7.8)
TIL
7.1
7.3±0.4 (6.7–8.1)
7.6±0.2 (7.4–8.0)
7.7±0.6 (6.6–9.2)
7.7±0.4 (7.2–8.1)
FL
6.9
6.7±0.4 (6.1–7.7)
6.9±0.3 (6.6–7.3)
7.4±0.5 (6.6–8.9)
7.5±0.3 (7.0–8.1)
UAL
3.6
3.8±0.2 (3.5–4.2)
4.0±0.2 (3.6–4.3)
4.0±0.2 (3.5–4.5)
3.9±0.2 (3.8–4.4)
FAL
3.3
3.4±0.2 (3.1–3.8)
3.6±0.5 (3.3–5.6)
3.6±0.3 (2.9–4.4)
3.7±0.3 (3.5–4.3)
HANDI
2.6
2.7±0.1 (2.5–2.9)
2.8±0.1 (2.6–3.0)
2.9±0.2 (2.4–3.3)
3.0±0.2 (2.8–3.2)
HANDII
2.5
2.6±0.1 (2.4–2.8)
2.7±0.1 (2.5–2.9)
2.7±0.2 (2.4–3.1)
2.8±0.1 (2.6–3.0)
HANDIII
3.5
3.6±0.2 (3.2–4.0)
3.8±0.1 (3.5–4.1)
3.9±0.3 (3.4–4.4)
4.0±0.2 (3.8–4.2)
HANDIV
2.3
2.4±0.2 (2.1–2.7)
2.5±0.1 (2.4–2.7)
2.6±0.3 (2.0–3.1)
2.7±0.1 (2.5–2.8)
WFD
0.5
0.5±0.1 (0.4–0.6)
0.6±0.0 (0.5–0.7)
0.5±0.1 (0.4–0.6)
0.5±0.0 (0.5–0.6)
WPF
0.3
0.3±0.0 (0.2–0.4)
0.3±0.0 (0.3–0.4)
0.4±0.1 (0.3–0.5)
0.3±0.0 (0.3–0.4)
DPT
0.5
0.5±0.1 (0.5–0.6)
0.6±0.0 (0.5–0.7)
0.6±0.1 (0.4–0.8)
0.5±0.0 (0.5–0.6)
WTT
0.4
0.4±0.0 (0.3–0.4)
0.4±0.0 (0.3–0.5)
0.5±0.1 (0.3–0.7)
0.5±0.1 (0.3–0.7)
WTD
0.6
0.7±0.1 (0.5–0.8)
0.7±0.1 (0.6–0.8)
0.6±0.1 (0.5–0.7)
0.7±0.1 (0.6–0.8)
TYM
0.8
0.9±0.1 (0.7–1.1)
0.9±0.1 (0.9–1.1)
0.8±0.1 (0.6–0.9)
0.9±0.1 (0.6–0.9)
EL
2.0
2.1±0.1 (2.0–2.4)
2.2±0.1 (2.1–2.4)
2.1±0.1 (1.9–2.4)
2.3±0.1 (2.1–2.5)
END
1.5
1.4±0.1 (1.2–1.8)
1.5±0.1 (1.4–1.7)
1.9±0.2 (1.4–2.1)
1.9±0.1 (1.8–2.0)
SL
2.2
2.0±0.2 (1.7–2.4)
2.1±0.1 (1.9–2.4)
2.5±0.2 (2.1–2.9)
2.7±0.1 (2.5–2.8)
Palmar tubercle rounded and conspicuous, diameter 0.42 mm. Thenar tubercle elliptical and conspicuous, width 0.29 mm. Diameter of thenar tubercle equals 69% of that of the palmar tubercle. Subarticular tubercles protruding, oval on finger I and rounded in other fingers; two tubercles on finger III but one in each of the others; distal tubercle smaller than proximal tubercle on finger III; tubercle on finger I larger than others. Supernumerary tubercles absent. Lateral keels on fingers I–IV, poorly defined on finger I. When placed side by side, the tip of finger IV reaches the distal subarticular tubercle of finger III. Preaxial phalangeal swelling on finger II and III. Relative length of fingers: IV < II < I < III. Discs are wider than the third phalanx on fingers I, III and IV, but approximately the same width on finger II. Paired dorsal digital scutes present.
Tibia and thigh lengths approximately the same (TIL/THL = 1.01), equal 49% and 48% of SVL, respectively. Foot length 97% of tibia length. Tarsal keel conspicuous and curved, narrowing towards the internal metatarsal tubercle. Internal metatarsal tubercle protuberant, elliptical. External metatarsal tubercle small and round, protruding, smaller than diameter of internal metatarsal tubercle. Metatarsal fold absent. Lateral keels present on preaxial and postaxial sides of each toe. Basal webbing between toes II and IV. Subarticular tubercles rounded and evident; one each on toes I and II but two each on toes III–V. Discs rounded, wider than distal phalanx on toes II, III and IV but of similar width on toe I; disc of toe V with smaller expansion compared to toes II–IV. Paired dorsal digital scutes present.
Dorsal skin smooth with small flattened and barely visible tubercles, mostly on the posterior portion; skin on arms smooth; skin on legs smooth with small tubercles. Ventral surface of body, arms and legs smooth.
In preservative (Fig. 4A–C), dorsal surface of body and limbs light brown; numerous dark brown melanophores form a longitudinal band, which is slightly constrained behind the eyes and diffuse towards the cloaca (Fig. 4A). A narrow and cream-colored dorsolateral stripe with an irregular upper border extends from posterior region of eyelids to mid-posterior region of body (Fig. 4B). Lateral stripe dark brown; darkest from the tip of the snout to the region above the axilla; lower border regular on snout but irregular in ventrolateral region of body (Fig. 4B). Paler oblique stripe diffuse, extends from the inguinal region to the axilla. Ventrolateral stripe absent. Ventrolateral region beige; melanophores form small dark brown irregular spots. Transverse dark brown bar on thigh and tibia is widest on tibia (Fig. 4A). Anterior region of thigh light brown, posterior region dark brown; paracloacal marks cream, conspicuous. Chest, throat and vocal sac cream with small dark brown melanophores; belly cream, lacks melanophores or dark spots. Ventral surface of arms beige with scarce brown melanophores; light brown on forearms. Mid-ventral surface of thigh and tibia cream, without melanophores; ventrolateral surface with irregular dark brown spots (Fig. 4C). Palmar and plantar surfaces dark brown (Figs 4C, 5A, C). Tongue longer than wide, with anterior third attached to the floor of the mouth, cream-colored (Fig. 4B).
Coloration in life is similar to that in preservative. Dark marks, spots, stripes, lines and bars are more conspicuous. Background coloration of the dorsum cream. Ventrolateral stripe discontinuous from the posterior corner of the eye to the axilla; small iridescent dots and spots visible below the dark brown band (Fig. 8A–C). Iris metallic bronze, pupil black. Ventral surface of arms and legs varies between light gray and rosaceous gray. Throat and vocal sac translucent white; chest and belly white. Paired digital dorsal scutes white.
Variation in the type series.
Variation in morphometric measurements of Allobatesalbiventrissp. nov. is summarized in Table 3. Sexual dimorphism is present in SVL and 12 body ratios. Females are larger than males (SVL; S2 = 10.3, F = 50.48, df = 36, adj p = 0.0002) but smaller in EN (S2 = 0.0006, F = 8.46, df = 33, adj p = 0.0152), THL (S2 = 0.0028, F = 20.94, df = 33, adj p = 0.0004), TIL (S2 = 0.0073, F = 11.64, df = 36, adj p = 0.0062), FL (S2 = 0.0025, F = 8.31, df = 36, adj p = 0.0152), UAL (S2 = 0.0010, F = 7.55, df = 36, adj p = 0.0195), FAL (S2 = 0.0006, F = 6.58, df = 33, adj p = 0.0266), HANDI (S2 = 0.0005, F = 8.87, df = 36, adj p = 0.0148), HANDII (S2 = 0.0004, F = 9.33, df = 36, adj p = 0.0139), HANDIV (S2 = 0.0005, F = 7.09, df = 36, adj p = 0.0220), WPF (S2 = 0.00003, F = 42.28, df = 27, adj p < .0001), WTT (S2 = 0.00002, F = 38.79, df = 27, adj p < .0001) and EL (S2 = 0.0003, F = 13.55, df = 36, adj p = 0.0035).
Unlike the holotype, a third subarticular tubercle is present on the proximal portion of toe IV in 53% of the rest of the type series (12 males and 8 females). When present, it is approximately half the size of other subarticular tubercles on the same toe (Fig. 7G, H).
Paratypes of Allobatesalbiventrissp. nov. A Female, MPEG44612, SVL 16.2 mm. B Male, INPAH45038, SVL 14.7 mm. C, F Female, INPAH45054, SVL 17.0 mm. D Male, INPAH45060, SVL 15.6 mm. E Male, INPAH45046, SVL 14.9 mm. G, H Male, INPAH45064, SVL 16.4 mm. White rectangle in (G) delimits the magnified region (H) illustrating the third tubercle on toe IV (arrow). Photographs by J.R.D. Souza.
https://binary.pensoft.net/fig/881726
In preservative, dorsal coloration of the type series ranges from light to dark brown (Fig. 7). Dark hourglass-like markings are present in 45% of males (n = 10) and 44% of females (n = 7) and are more noticeable in individuals with lighter background coloration (e.g., Fig. 7B, C). In the other specimens, a light-to-dark-brown band extends down the center of the dorsum from the interorbital region to the urostyle. The light dorsolateral line is present in all males and females. However, its variable thickness is more evident in specimens lacking hourglass markings (Fig. 7E). Conspicuous dark transverse bars on the tibia, which are barely visible or absent on the thigh, are present in 71% of specimens (12 males and 15 females). Both males and females lack visible melanophores on the belly (Fig. 7D, F) but the sexes differ with respect to the presence and concentration of melanophores on the chest and throat; melanophores are present on the chest in 72% of males (n = 16) but only 31% of females (n = 5). Although melanophores are present on the throat of all individuals, females have fewer of them and they are distributed mainly in the anterior and peripheral region of the throat, while males have more, evenly distributed, melanophores.
As in the holotype, coloration in life is similar to that in preservative (Fig. 7). The lateral brown stripe is darkest from the tip of the snout to the region above the axilla, becoming lighter and more diffuse as it extends to the inguinal region (Fig. 8A, E, H).
Coloration in life of Allobatesalbiventrissp. nov. from Manoel Urbano and Rio Branco, State of Acre, Brazil. A–C Male holotype, SVL 14.6 mm; D–F Female, INPAH45051, SVL 16.8 mm; G–I Male, MNRJ 91679, SVL 16.0 mm; J–L Female, MPEG44613, SVL 16.0 mm; M Male, uncollected; N Male, INPAH45044, SVL 15.3 mm; O Male, uncollected. Photographs by J.R.D. Souza (A–F, J–O) and P.R. Melo-Sampaio (G–I).
The advertisement call of Allobatesalbiventrissp. nov. is formed by a pair of notes that is emitted singly or in a series of as many as 16 calls. Calls emitted in series of one, two, three, four or five calls correspond to 88% of recorded call arrangements (Fig. 9A–E). Calls have an average duration of 50±4 ms (42–60 ms). The first note of each call is always shorter (13±2 ms; 8–20 ms) than the second one (20±2 ms; 14–26 ms) (Fig. 10B), and the inter-note interval ranges from 8 to 23 ms (16±4 ms). Call series with two calls have a duration of 220–610 ms (320±70 ms), while series with three, four or five calls have a duration of 370–1,030 ms (600±110 ms), 580–1,420 ms (950±170 ms) and 790–1,700 ms (1,260±200 ms), respectively. The inter-call interval within call series is 130–390 ms (210±50 ms); the interval between call series is 410–4,400 ms (1,010±670 ms). Notes have modulated frequencies, ascending from beginning to end (Fig. 10B–E). The first note has a slightly lower dominant frequency (5,409±211 Hz; 4,952–5,857 Hz) than the second note (5,849±250 Hz; 5,189–6,331 Hz). Lower and upper frequency values are presented in Table 4.
Advertisement calls of the holotype of Allobatesalbiventrissp. nov. (INPAH45035, FNJV 53687). A Oscillogram showing the continuous emission of calls with variable arrangements. Spectrograms and oscillograms of the four most common call arrangements: single call (B) and series of two (C), three (D) and four calls (D). Note that each call is composed of two notes. Air temperature: 22°C. Abbreviations: dB, decibels; kHz, kilohertz; s, seconds.
Preserved tadpole of Allobatesalbiventrissp. nov. (lot INPAH45066), Gosner stage 34. (A) Dorsal, (B) lateral and (C) ventrolateral views of the body, and (D) ventral and (E) ventrolateral views of the oral disc. Scale bar: 10 mm (A–C) and 1 mm (D, E). Photographs by J.R.D. Souza.
https://binary.pensoft.net/fig/881729
Advertisement call parameters of Allobatesalbiventrissp. nov. Values represent the mean for each calling male. Call parameters are described in the text. Localities: ANT, Antimary River; FEI, Feijó; MUR, Manoel Urbano; PCM, Parque Ambiental Chico Mendes; REA, Reserva Extrativista Arapixi. Abbreviations: AT, air temperature in degrees Celsius; FNJV, call voucher recordings are deposited in the Fonoteca Neotropical Jacques Vielliard; SD, standard deviation.
FNJV
Locality
AT
CSD
ICSI
CD
ICI
ND1
INI
ND2
LFN1
HFN1
DFN1
LFN2
HFN2
DFN2
Unvouchered
FEI
NA
480
2,010
49
160
12
19
18
5,015
5,608
5,336
5,361
5,831
5,607
Unvouchered
PCM
NA
1,040
1,190
58
240
13
20
24
4,893
5,523
5,222
5,263
5,739
5,487
53688
PCM
23.0
1,560
1,210
52
210
11
21
20
5,448
6,048
5,792
5,875
6,336
6,141
53689
PCM
23.5
700
1,680
52
230
10
22
20
4,823
5,362
5,065
5,118
5,617
5,381
Unvouchered
REA
28.0
940
1,230
49
280
10
20
18
5,374
6,008
5,705
5,695
6,222
5,991
53692
REA
28.0
440
620
47
200
11
17
20
5,181
5,944
5,606
5,685
6,273
6,002
53693
REA
29.0
360
760
48
210
13
16
18
5,023
5,714
5,400
5,522
6,006
5,768
53680
ANT
25.0
790
920
48
210
12
16
20
4,739
5,213
5,017
5,276
5,658
5,476
53681
ANT
24.5
1,050
690
51
240
13
16
21
5,09
5,673
5,416
5,548
6,083
5,861
53682
MUR
24.0
670
640
49
230
15
14
19
5,194
5,621
5,405
5,619
6,070
5,840
53685
MUR
22.0
1,400
2,120
48
220
13
14
20
5,312
5,858
5,618
5,702
6,307
6,083
53686
MUR
22.0
650
730
45
200
13
11
21
5,352
5,941
5,591
5,995
6,507
6,294
53687
MUR
22.0
780
660
45
230
13
12
20
5,098
5,663
5,392
5,709
6,267
6,036
53684
MUR
22.0
630
880
47
200
16
11
20
5,179
5,73
5,465
5,702
6,176
5,978
53683
MUR
22.0
610
850
51
230
16
15
21
5,044
5,523
5,237
5,519
6,033
5,810
53691
MUR
22.0
440
560
45
160
13
12
21
5,084
5,638
5,353
5,568
6,082
5,825
53690
MUR
21.0
550
950
50
240
12
17
20
5,036
5,493
5,278
5,568
6,020
5,805
Mean
–
23.9
700
1,010
50
210
13
16
20
5,120
5,687
5,409
5,577
6,076
5,849
SD
–
2.6
650
670
4
50
2
4
2
206
228
211
233
247
250
Min
–
21.0
40
410
42
130
8
8
14
4,640
5,153
4,953
4,909
5,413
5,189
Max
–
29.0
4,470
4,400
60
390
20
23
26
5,576
6,127
5,857
6,195
6,552
6,331
Eggs and larvae.
Descriptions of quantitative characters of tadpoles are based on six specimens at Gosner stage 34. Morphometric measurements are presented in Table 5. Body ovoid in dorsal view, ellipsoid in lateral view (Fig. 10A–C). Body length (BL) 31–33% of total length (TL) and tail length 67–69% of TL; body wider than tall (BH 50–65% of BW) and longer than wide (BW 61–80% of BL); HWLE 72–93% of BW; snout rounded in dorsal and lateral view; END 60–78% of ED; eyes directed dorsally and laterally; IOD 26–33% of HWLE. Nostrils located dorsolaterally and directed anterolaterally, visible in dorsal and lateral view; inter-nostril distance 38–44% of HWLE. Fleshy ring present on inner margin of nostrils, round, not ornamented. Spiracle single, sinistral, tubular, 0.46–0.67 mm long; it is attached laterally, a little below half body length and just dorsal to the intestine. Gut coiled. Vent tube dextral, 1.23–1.60 mm long. Dorsal fin arises around 2 mm from the junction of tail with body, shallow edge anteriorly, maximum height at mid posterior region of tail (Fig. 10B). Dorsal fin higher than ventral fin. Tail tip acuminate, not flagellated. Maximum tail height 2.44–2.69 mm. Width of tail musculature 35–50% of body width; height of tail musculature 59–77% of body height.
Morphometric measurements in millimeters of 12 tadpoles of Allobatesalbiventrissp. nov., Gosner stages 34–37, from Manoel Urbano, Acre, Brazil. Values depict mean ± standard deviation (range). Trait acronyms are defined in the text; n, sample size.
Traits
Stage 34 (n = 6)
Stage 35 (n = 1)
Stage 36 (n = 3)
Stage 37 (n = 2)
TL
17.14 ± 0.48 (16.55–17.81)
17.72
19.26 ± 0.13 (19.15–19.40)
20.03 ± 0.06 (19.99–20.08)
TAL
11.61 ± 0.38 (11.26–12.26)
12.10
13.13 ± 0.05 (13.10–13.19)
13.69 ± 0.00 (13.69–13.69)
BL
5.53 ± 0.19 (5.29–5.80)
5.63
6.13 ± 0.08 (6.05–6.22)
6.34 ± 0.06 (6.30–6.38)
BW
3.85 ± 0.36 (3.36–4.28)
4.12
3.53 ± 0.08 (3.44–3.61)
4.03 ± 0.24 (3.86–4.20)
BH
2.23 ± 0.19 (1.93–2.44)
2.18
2.27 ± 0.15 (2.10–2.35)
2.60 ± 0.12 (2.52–2.69)
HWLE
3.19 ± 0.21 (3.02–3.53)
3.70
3.02 ± 0.00 (3.02–3.02)
3.40 ± 0.06 (3.36–3.44)
TMW
1.55 ± 0.09 (1.43–1.68)
1.43
1.51 ± 0.08 (1.43–1.60)
1.64 ± 0.18 (1.51–1.76)
MTH
2.58 ± 0.09 (2.44–2.69)
2.69
2.80 ± 0.10 (2.69–2.86)
2.94 ± 0.12 (2.86–3.02)
TMH
1.54 ± 0.10 (1.43–1.68)
1.51
1.62 ± 0.05 (1.60–1.68)
1.68 ± 0.00 (1.68–1.68)
IOD
0.99 ± 0.35 (0.92–1.05)
1.01
1.04 ± 0.05 (1.02–1.09)
1.13 ± 0.06 (1.09–1.18)
IND
1.33 ± 0.06 (1.26–1.43)
1.43
1.48 ± 0.13 (1.34–1.60)
1.47 ± 0.06 (1.43–1.51)
END
0.57 ± 0.04 (0.50–0.63)
0.55
0.52 ± 0.02 (0.50–0.55)
0.59 ± 0.00 (0.59–0.59)
NSD
0.52 ± 0.07 (0.42–0.63)
0.50
0.67 ± 0.15 (0.50–0.80)
0.57 ± 0.09 (0.50–0.63)
ED
0.82 ± 0.04 (0.76–0.88)
0.84
0.91 ± 0.06 (0.84–0.97)
0.92 ± 0.00 (0.92–0.92)
SS
3.77 ± 0.23 (3.36–4.03)
4.20
4.17 ± 0.27 (3.86–4.37)
4.09 ± 0.06 (4.03–4.12)
VTL
1.39 ± 0.13 (1.23–1.60)
1.55
1.50 ± 0.19 (1.36–1.71)
1.50 ± 0.05 (1.46–1.53)
STL
0.55 ± 0.07 (0.46–0.67)
0.42
0.55 ± 0.04 (0.50–0.59)
0.67 ± 0.06 (0.63–0.71)
ODW
1.67 ± 0.18 (1.44–1.93)
1.53
1.46 ± 0.14 (1.33–1.61)
1.76 ± 0.23 (1.60–1.92)
PL
0.68 ± 0.06 (0.59–0.74)
0.81
0.67 ± 0.13 (0.52–0.76)
0.85 ± 0.06 (0.81–0.89)
AL
0.48 ± 0.03 (0.42–0.50)
0.50
0.62 ± 0.03 (0.59–0.64)
0.59 ± 0.07 (0.54–0.64)
DG
0.47 ± 0.05 (0.40–0.54)
0.62
0.55 ± 0.04 (0.50–0.59)
0.57 ± 0.05 (0.54–0.60)
A1
1.16 ± 0.05 (1.08–1.21)
1.14
1.13 ± 0.07 (1.08–1.21)
1.23 ± 0.06 (1.19–1.28)
A2
1.07 ± 0.04 (1.01–1.11)
1.02
1.05 ± 0.04 (1.01–1.09)
1.18 ± 0.01 (1.18–1.19)
P1
1.02 ± 0.11 (0.82–1.11)
0.99
1.01 ± 0.10 (0.91–1.11)
1.19 ± 0.00 (1.19–1.19)
P2
0.98 ± 0.08 (0.82–1.08)
0.97
0.99 ± 0.04 (0.94–1.02)
1.18 ± 0.00 (1.18–1.18)
P3
0.67 ± 0.14 (0.50–0.84)
0.49
0.49 ± 0.04 (0.47–0.54)
0.76 ± 0.04 (0.74–0.79)
UJW
0.67 ± 0.00 (0.67–0.67)
0.67
0.56 ± 0.10 (0.50–0.67)
0.67 ± 0.00 (0.67–0.67)
UJL
0.74 ± 0.05 (0.67–0.82)
0.94
0.81 ± 0.04 (0.76–0.84)
0.77 ± 0.07 (0.77–0.77)
Oral disc positioned anteroventrally, laterally emarginate, oval in ventral view (Fig. 10B, C), 1.44–1.93 mm wide, and corresponding to 37–49% of body width at height of spiracle. Anterior labium with four short pyramidal papillae distributed in a single row and two papillae at each end of the labium (Fig. 10D, E). Posterior labium with a single row of 10–13 papillae, of which one or two are pyramidal at each end and the rest are cylindrical. Cylindrical papillae vary in size along the labium, being shorter at the ends and medially (Fig. 10D, E). Submarginal papillae absent. Upper jaw sheath arch-shaped, longer than lower jaw sheath and without median cut. Lower jaw V-shaped. Sheaths with serrations along their entire length. Labial formula of the keratodont row (LTRF) is 2(2)/3(1). Row A-1 measures 1.16±0.05 mm; A-2 measures 1.07±0.04 mm but is interrupted in the central region by a gap of approximately 40%. Row P-1 measures 1.02±0.11 mm, with a small medial gap. Rows P-2 and P-3 are complete; they measure 0.98±0.08 mm and 0.67±0.14 mm, respectively (Fig. 10D).
In preservative, body and tail muscles assume different shades of cream, with brown melanophores forming blotches and spots of various shapes and sizes. Fins cream but translucent, with brown spots of various shapes and sizes resembling a marbled pattern. Venter cream but translucent, with thickened brown melanophores mainly in the central region. Internal organs are visible through the skin (Fig. 10C).
Geographic distribution and natural history.
Allobatesalbiventrissp. nov. is known from only five localities in southwestern Brazilian Amazonia: four in the State of Acre and one in the State of Amazonas (Figs 1 and 11). The species inhabits the leaf litter of primary and secondary ombrophilous forests at elevations between 125 and 184 m asl (Fig. 11). It has a diurnal habit and is generally active between 0500 and 1800 h, with vocal activity peaks between 0500–0900 h and 1600–1800 h.
Geographic distribution of Allobatesalbiventrissp. nov. Star = type locality (1 Manoel Urbano); circles = additional paratype localities (2 Antimary River; 3 Parque Ambiental Chico Mendes); and rhombus (4 Feijó; 5 Reserva Extrativista Arapixi). White triangles denote sampled localities where the new species was not recorded.
https://binary.pensoft.net/fig/881730
Allobatesalbiventrissp. nov. breeds in the rainy season between November and March. Males vocalize both on litterfall and while perched on shrubs or fallen branches up to 40 cm above ground (Fig. 8M). Clutches are deposited on the adaxial portion of living, attached leaves of small shrubs approximately 10–15 cm from the ground (Fig. 12F–H). We found eight egg clutches—three at the type locality (Manoel Urbano, Acre), four in Parque Ambiental Chico Mendes (Rio Branco, Acre) and one in Reserva Extrativista Arapixi (Boca do Acre, Amazonas). The number of eggs per clutch ranged from 17 to 31 (Fig. 12F, G). Two clutches were found on the same leaf (nest) (Fig. 12H). In freshly laid eggs, approximately half of the animal pole is darkly pigmented; the rest of the egg is white. The eggs are surrounded by an opaque, colloidal gel (Fig. 12F, G), which becomes denser and more opaque over the course of larval development.
Habitat and natural history of Allobatesalbiventrissp. nov. A Typical understory of open ombrophilous forest at the type locality in Manoel Urbano, State of Acre, Brazil. B Beginning of courtship behavior, in which a male is leading a female to an oviposition site. C Female (unvouchered) positioning herself to jump to the adaxial surface of the leaf, where the male is vocalizing. D Mating pair (unvouchered) in cephalic amplexus. E Mating pair (unvouchered) on the leaf, with the female in oviposition and the male silent. F Recently deposited clutch, with the smallest clutch recorded (17 eggs). G The largest clutch recorded (31 eggs). H Mating pair on a leaf, where a male vocalizes while a female deposits a second clutch on the same leaf. I Male INPAH45045 carrying 10 tadpoles on his back. Photographs by J.R.D. Souza.
https://binary.pensoft.net/fig/881731
Four mating pairs were observed in courtship, one at the type locality and three in Parque Ambiental Chico Mendes. Each observation began with the approach of a female to the perch where a male was emitting courtship calls. In each case, the male, perceiving the approach of a female, began to emit courtship calls interspersed with advertisement calls. He then jumped from the call perch and attempted to guide the female (Fig. 12B) by conducting her to an oviposition site (bushes or seedlings) located up to 3 m from the perch. During the courtship march (sensu Rocha et al. 2018), which lasted between 3 and 5 min, the male continued to emit advertisement and courtship calls while the female sporadically made short stops. Once arriving at the oviposition site, the male jumped to the adaxial surface of the leaf, located 10–15 cm from the ground, and continued vocalizing. The female followed the male and positioned herself underneath the leaf, at the edge closest to the ground. She then observed the male, raising her head toward the leaf. In all courtships, females positioned themselves vertically, with forelimbs only lightly touching the ground, for up to 1 min before jumping to the leaf (Fig. 12C). After the jump, the female approached the male. On one occasion, the female faced the male and put her snout on the male’s pectoral region, then turned in the opposite direction. The male then climbed onto the female’s back and they initiated amplexus (it was not possible to clearly discern the type of amplexus). In the other courtships, the female approached the male and quickly was grabbed by him. The male positioned himself laterally, snout to snout, and with one hand held the female’s head, either by the region between the eyes and nostrils or directly on the snout (Fig. 12D). The resulting cephalic amplexus lasted from 1 to 4 min. During and after amplexus, a barely audible vocalization (similar to “cheeps”), was emitted by the male. Following amplexus, on one occasion the male quickly jumped into the leaf litter and returned to vocalize within 3 min. In the three other courtships, the male remained on the leaf while the female deposited eggs (Fig. 12E, H) but left the leaf before she finished. Two males initiated advertisement calls while the female was still ovipositing (Fig. 12H), while the third left the nest without vocalizing. On two occasions oviposition started with the male still in amplexus.
During oviposition, females repeatedly moved their heads upwards. This movement was interspersed with continuous clockwise or counterclockwise rotations relative to the vertical plane. Oviposition lasted ~11 to 15 min and ended when the female stopped the tilting motion with her head. However, she remained at the nest, on the clutch, and performed sporadic returns (apparently, hydrating the clutch, as her skin became excessively moist). Residence time of each female after oviposition ranged from 10 to 15 min, and the total time in the nest from 21 to 30 min. Males returned to the nest between 25 and 30 min after the female left, probably to hydrate the eggs and promote swelling of the surrounding jelly. We collected one clutch immediately after the female’s departure, prior to the male’s return, and the embryos developed normally. Only one male was observed performing larval transport (Fig. 12I).
Discussion
Nearly 10 years ago, Simões et al. (2013b) reported that nurse frogs from the middle Juruá and Ituxi rivers attributed to Allobatesgasconi likely represent independent evolutionary lineages, a claim that was later corroborated by Vacher et al. (2020) through molecular delimitation methods. However, the absence of topotypical genetic and bioacoustic data for A.gasconi sensu stricto hampered the subsequent taxonomic study of related taxa (Melo-Sampaio et al. 2018). Recently, Ferreira et al. (2023) showed, based on topotypical data, that A.gasconi sensu stricto is not closely related to several populations previously assigned to it. Allobatesalbiventris is the first nominal species of this complex to be named and described. Since the name A.gasconi is not applicable to any population in this species complex, we instead refer to it as the A.albiventris species complex. The number of candidate species associated with A.albiventris differs among phylogenetic studies (Vacher et al. 2020; Réjaud et al 2020; Ferreira et al. 2023; present study). However, molecular delimitation as presented here represents an initial attempt to delimit species, and we emphasize the need to further integrate morphologic, genetic and bioacoustic data to fully evaluate the cryptic diversity associated with A.albiventris.
Allobatesalbiventris is known from five lowland localities in southwestern Brazilian Amazonia. The species inhabits open ombrophilous forests dominated by bamboos of the genus Guadua and occupies pristine as well as secondary forests with low to moderate levels of anthropization (e.g., Parque Ambiental Chico Mendes and Reserva Extrativista Arapixi). Twelve additional localities, all at elevations above 300 m asl, were sampled in the upper Juruá and Purus river basins, but A.albiventris was only found below 200 m asl. We also surveyed seven permanent sampling modules along the upper Madeira River, all < 200 m asl in open ombrophilous forests dominated by palms, but we found only A.aff.albiventris (gasconi) SL3 (Vacher et al. 2020). The geographic distribution of A.albiventris seems bounded on the east by the Acre River and on the west by the Envira River. Geographic distribution of other candidates in the A.albiventris complex remains poorly known since each is currently known from one or two localities (Appendix 3); further sampling in southwestern and central Amazonia is needed to clarify the range of each candidate and their limiting drivers.
Réjaud et al. (2020) suggest that modern large rivers promoted diversification of Allobates after the end of the Pebas system and that meandering rivers in western Brazilian Amazonia (e.g., Juruá and Purus rivers) may have played a modest role as biogeographic barriers, especially with respect to the diversification of early diverging species. Although the divergence time between A.aff.albiventris SL3 and the A.tapajos species complex is estimated at ~ 9.4 Mya (Réjaud et al. 2020), the divergence time among lineages of the A.albiventris species complex remains unknown. As this species complex is endemic to southwestern Amazonian lowlands and its distribution seems limited by small rivers and altitude, further biogeographic studies focused on its diversification may clarify the role of historical and geographical drivers in the speciation of this relatively ancient Amazonian frog complex.
Funding
This work was funded by the Brazilian Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (Universal grant no. 401120/2016-3 to APL), Brazilian Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Fundação de Amparo a Pesquisa do Estado do Amazonas—FAPEAM (BIODIVERSA Edital 007/2021, proc. 001760.2021-00). Miquéias Ferrão received an Edward O. Wilson Biodiversity Postdoctoral Fellowship from the Harvard Museum of Comparative Zoology and a fellowship from the David Rockefeller Center for Latin American Studies of Harvard University. Antonio Saulo Cunha Machado received a fellowship from FAPEAM (BIODIVERSA proc. 01.02.016301.03252/2021-67). Fieldwork in the Arapixi Extractive Reserve was supported by the Programa de Áreas Protegidas da Amazônia (ARPA), grant 010483/15. Paulo Roberto Melo-Sampaio received a fellowship from the Coordenacão de Aperfeiçoamento de Pessoal de Nível Superior (CAPES; process 88882.183267/2018-01). Funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Competing interests
The authors declare that they have no competing interests.
Acknowledgments
We thank Ana Prudente (MPEG), João F. M. Sarmento (MPEG), Fernanda P. Werneck (INPAH) and Ariane Silva (INPAH) for providing access to collections under their care; Luís Felipe Toledo and Simone Dena for providing access to Fonoteca Neotropical Jacques Vielliard; Valfredo C. Lima for logistic support; and Vinicius Guerra for helping with the advertisement call figure. Specimens were collected under permit number 1337-1 provided by the Instituto Brasileiro do Meio Ambiente e dos Recursos Naturais Renováveis (IBAMA) and by the Instituto Chico Mendes de Conservacão da Biodiversidade (ICMBio). Protocols regarding animal collection and care follow Conselho Federal de Biologia resolution number 148/2012.
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Species, museum voucher specimens and GenBank accession numbers of sequences used in molecular analyses. Accession numbers in bold font denote sequences generated in the present study.
Species
Voucher
12S
16S
ND1
COI
cyt b
Allobatesaff.granti
125PG
JN690205
JN690931
A.aff.magnussoni
977126
MT627173
MT627173
MT627173
MT627173
MT627173
A.aff.melanolaemus
MTR28013
MT627203
MT627203
MT627203
MT627203
MT627203
A.aff.olfersioides 1
MTR17821
KDQF01003353
A.aff.olfersioides 2
MTR16435
MT627202
MT627202
MT627202
MT627202
MT627202
A.aff.olfersioides 3
JFT959
KDQF01002701
A.aff.tapajos 1
MTR10084
MT627197
MT627197
MT627197
MT627197
MT627197
A.aff.tapajos 2
AF1906
MT627175
MT627175
MT627175
MT627175
MT627175
A.aff.tinae 1
MPEG13397
DQ502213
DQ502213
DQ502900
DQ502648
A.aff.trilineatus 1
FGZC3247
MT627185
MT627185
MT627185
MT627185
MT627185
A.aff.trilineatus 2
JMP2313
MT627195
MT627195
MT627195
MT627195
MT627195
A.aff.undulatus
AMNHA159139
DQ283044
DQ283044
DQ502756
DQ502459
A.algorei
TNHCFS5551
HQ290950
HQ290950
HQ290950
HQ290530
A.amissibilis
PK3798
MT627204
MT627204
MT627204
MT627204
MT627204
A.bacurau
INPAH35401
KU195701
A.caeruleodactylus
MTR10227
MT627199
MT627199
MT627199
MT627199
MT627199
A.caldwellae
MPEG13826
DQ502099
DQ502099
DQ502531
A.carajas
BM163
MT627183
MT627183
MT627183
MT627183
MT627183
A.chalcopis
Alca1
MT627182
MT627182
MT627182
MT627182
A.albiventrissp. nov.
MCP13630
KY886577
KY886618
A.albiventrissp. nov.
MNRJ91665
KY886576
KY886617
A.albiventrissp. nov.
MNRJ91679
KY886578
KY886619
A.albiventrissp. nov.
MNRJ91683
KY886574
KY886615
A.albiventrissp. nov.
MNRJ91684
KY886575
KY886616
A.albiventrissp. nov.
INPAH45061
ON937753
A.albiventrissp. nov.
INPAH45060
ON937752
A.albiventrissp. nov.
INPAH45064
ON937746
A.albiventrissp. nov.
INPAH45065
ON937745
A.albiventrissp. nov.
INPAH45048
ON937748
A.albiventrissp. nov.
INPAH45044
ON937749
A.albiventrissp. nov.
INPAH45035
ON937750
A.albiventrissp. nov.
INPAH45051
ON937751
A.albiventrissp. nov.
INPAH45040
ON937747
A.conspicuus/subfolionidificans
FGZC3279
MT627186
MT627186
MT627186
MT627186
MT627186
A.crombiei
AF1097
MT627174
MT627174
MT627174
MT627174
MT627174
A.femoralis
AF3224
MT627179
MT627179
MT627179
MT627179
MT627179
A.femoralisSS
AfemShucv3a
DQ523001
DQ523072
DQ523142
A.flaviventris
HJ545
MT627192
MT627192
MT627192
MT627192
MT627192
A.fratisenescus
QCAZ54377
MF624172
MF614174
A.gasconi sensu stricto
GGU684
MT524137
A.gasconi sensu stricto
APL23345
ON997555
A.gasconi sensu stricto
APL23342
ON997554
A.gasconi sensu stricto
APL23346
ON997547
A.gasconi sensu stricto
APL23354
ON997552
A.gasconi sensu stricto
APL23411
ON997558
A.aff.albiventris SL1
APL14410
KJ747333
A.aff.albiventris SL1
APL14411
KJ747334
A.aff.albiventris SL1
APL14416
KJ747335
A.aff.albiventris SL2
APL23940
OQ297604
A.aff.albiventris SL2
APL24058
OQ297605
A.aff.albiventris SL2
APL24068
OQ297606
A.aff.albiventris SL2
APL24070
OQ297607
A.aff.albiventris SL2
APL24071
OQ297608
A.aff.albiventris SL3
HJ480
MT627191
MT627191
MT627191
MT627191
MT627191
A.aff.albiventris SL3
HJ299
KDQF01002640
A.aff.albiventris SL5
MNRJ 91681
KY886572
A.aff.albiventris SL5
MNRJ 91682
KY886573
KY886614
A.aff.albiventris SL5
OMNH36636
DQ502209
DQ502209
DQ502898
DQ502644
A.aff.albiventris SL5
MPEG13003
DQ502052
DQ502052
DQ502777
DQ502483
A.aff.albiventris SL5
MNRJ 90229
KY886570
KY886612
A.aff.albiventris SL5
MNRJ 90230
KY886571
KY886613
A.goianus
SAMA8574
MT627207
MT627207
MT627207
MT627207
MT627207
A.granti
AF1998
MT627176
MT627176
MT627176
MT627176
MT627176
A.grillicantus
MPEG43046
MW220039
A.grillisimilis
MTR12749
MT627200
MT627200
MT627200
MT627200
MT627200
A.hodli
ABU2194
KX044279
A.humilis/pittieri
CVULA5690
KJ940454
KJ940454
A.insperatus/juami
JMP1703
MT627193
MT627193
MT627193
MT627193
MT627193
A.juanii/ranoides
ARA2394
DQ502271
DQ502271
DQ502933
DQ502702
A.kamilae
HJ285
MT627189
MT627189
MT627189
MT627189
MT627189
A.kingsburyi
QCAZ16523
AY364549
HQ290963
HQ290541
A.magnussoni
BM168
MT627184
MT627184
MT627184
MT627184
MT627184
A.marchesianus
AJC2498
MT627180
MT627180
MT627180
MT627180
MT627180
A.masniger
MTR10155
MT627198
MT627198
MT627198
MT627198
MT627198
A.melanolaemus
NMP6V711404
MT524148
A.nidicola
MPEG13821
DQ502101
DQ502101
DQ502533
A.niputidea
MUJ3520
DQ502272
DQ502272
DQ502934
DQ502703
A.nunciatus
MPEG36777
MT627196
MT627196
MT627196
MT627196
MT627196
A.olfersioides
MNRJ79897
MF624178
MF624178
MF614175
A.ornatus
MHNSM22863
EU342550
A.pacaas
MZUSP158938
MT076999
A.paleovarzensis
JMP2196
MT627194
MT627194
MT627194
MT627194
A.sieggreenae
MCP14533
MW293942
A. sp. Huanuco
FGZC3348
MT627187
MT627187
MT627187
MT627187
MT627187
A. sp. Neblina
MTR15537
MT627201
MT627201
MT627201
MT627201
MT627201
A.sumtuosus
AF2212
MT627177
MT627177
MT627177
MT627177
MT627177
A.talamancae
QCAZ35236
MT627205
MT627205
MT627205
MT627205
MT627205
A.tapajos
MJH3973
DQ502110
DQ502110
DQ502820
DQ502542
A.tinae
HJ298
MT627190
MT627190
MT627190
MT627190
MT627190
A.trilineatus
AF4493
MT524111
A.undulatus
AJC3040
MT627181
MT627181
MT627181
MT627181
MT627181
A.velocicantus
MCP10187/88
MF624181
MF624181
MF614178
A.zaparo
USNM546405
DQ502026
DQ502026
DQ502752
DQ502455
Ameeregahahneli
AF2673
MT627178
MT627178
MT627178
MT627178
MT627178
Anomaloglossusstepheni
MJH3928
DQ502107
DQ502107
DQ502818
DQ502539
Aromobatessaltuensis/nocturnus
TNHCFS5541/AMNHA130042
HQ290970
HQ290970
HQ290970
DQ502860
DQ502592
Colostethusbrachistriatus
CZPDUV4603
MF624204
MF624204
MF614304
MF614198
Dendrobatesauratus
MVZHerp149723
JX564862
JX564862
JX564862
JX564862
JX564862
Epipedobatesboulengeri
UMMZ227952/QCAZ16574
HQ290997
HQ290997
HQ290997
DQ502742
DQ502447
Leucostethusfugax
QCAZ16513
HQ290958
HQ290958
HQ290958
HQ290538
Mannophrynecollaris
FS5523
MT627188
MT627188
MT627188
MT627188
MT627188
Phyllobatesterribilis
TNHC64420/AMNHA118566
HQ291006
HQ291006
HQ291006
DQ502861
DQ502593
Rheobatespalmatus
RHEOPALM
MT627206
MT627206
MT627206
MT627206
MT627206
Silverstoneianubicola/erasmios
TNHCFS4942/MAR336
HQ290966
HQ290966
HQ290966
MF614333
MF614237
Appendix 2
Specimens examined. Acronyms: INPAH, Herpetological Collection of the Instituto Nacional de Pesquisas da Amazônia, Manaus, Amazonas, Brazil; MNRJ, Museu Nacional do Rio de Janeiro, Rio de Janeiro, Brazil; MPEG, Herpetological Collection of the Museu Paraense Emílio Goeldi, Belém, Pará, Brazil; MZUSP, Museu de Zoologia, Universidade de São Paulo, São Paulo, Brazil. UFAC-RB, Herpetological Collection of the Universidade Federal do Acre, Rio Branco, Acre, Brazil.
Allobatescaeruleodactylus. Adults. Brazil: Amazonas: km 12 on the road to Autazes (INPAH 7238 [holotype]; 7229–32, 7234–37 [paratypes]). Tadpoles. Brazil: Amazonas: km 12 on the road to Autazes [lots INPAH 8037–46, 8085].
Allobatessubfolionidificans.
Adults. Brazil: Acre: Rio Branco, Parque Zoobotanico da Universidade Federal do Acre (INPAH 13760 [holotype], 11959–74, 13749–54 [paratypes]). Tadpoles. Brazil: Acre: Rio Branco, Parque Zoobotânico da Universidade Federal do Acre (lots INPAH 14822, 14823).
Allobatestapajos. Adults. Brazil: Pará: Parque Nacional da Amazônia (INPAH 34425 [holotype]; 34402–24 [paratypes]). Tadpoles. Brazil: Pará: Parque Nacional da Amazônia (lots INPAH 34426–27).
Allobatestinae. Adults. Brazil: Rondônia: Porto Velho, west bank of upper Madeira River (INPAH 41012–21, 41029–36, 41041–44); Amazonas: Boca do Acre (INPAH 40976, 41022, 41027, 41037, 41040; MNRJ 90214 [holotype], 90215–28, [paratypes]; UFAC-RB 4625 [paratype]); Acre: Senador Guiomard (UFAC-RB 4604, 4636–37 [paratypes]).
Allobatestrilineatus. Adults. Brazil: Acre: Rio Branco, Parque Zoobotânico of Universidade Federal do Acre (INPAH 11958–93)
Allobatesvanzolinius. Adults. Brazil: Amazonas: Juruá River, Vai-Quem-Quer (INPAH 4896 [holotype]; 4903–05, 4912 [paratypes]); Jainu, Rio Juruá (INPAH 3381, 3413 [paratypes]).
Allobatesvelocicantus.
Adults. Brazil: Acre: Mâncio Lima (INPAH 41342 [holotype], 41338–41, 41344–48 [paratypes]). Tadpoles. Brazil: Acre: Mâncio Lima (lot INPAH 41351).
Geographic distribution of samples of Allobatesgasconi and A.albiventris species complex included in the phylogenetic analyses. Lineage numbering (SL) follows those of Figure 2.
: Morphometric measurements of Allobatesalbiventrissp. nov. and A.gasconi.
https://binary.pensoft.net/file/881733This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.Souza JRD, Ferrão M, Kaefer IL, Cunha-Machado AS, Melo-Sampaio PR, Hanken J, Lima AP (2023)10.3897/vz.73.e103534.suppl23FA8BA24-D863-5765-9BAA-57ED4EB12DBE
Table S2
: .xlsx
: Morphometric measurements of tadpoles of Allobatesalbiventrissp. nov.
https://binary.pensoft.net/file/881734This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.Souza JRD, Ferrão M, Kaefer IL, Cunha-Machado AS, Melo-Sampaio PR, Hanken J, Lima AP (2023)10.3897/vz.73.e103534.suppl39DC1C938-FE96-56D8-B6E3-DB73C0CF08A3
Figure S1
: .png
: Maximum likelihood phylogenetic tree of Allobates based on five mitochondrial genes (12S, 16S, COI, ND1 and cyt b).
https://binary.pensoft.net/file/881735This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.Souza JRD, Ferrão M, Kaefer IL, Cunha-Machado AS, Melo-Sampaio PR, Hanken J, Lima AP (2023)