Research Article |
Corresponding author: V. Deepak ( veerappandeepak@gmail.com ) Academic editor: Uwe Fritz
© 2024 Sandeep Das, Saunak Pal, Surya Narayanan, K. Subin, Muhamed Jafer Palot, K. P. Rajkumar, V. Deepak.
This 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.
Citation:
Das S, Pal S, Narayanan S, Subin K, Palot MJ, Rajkumar KP, Deepak V (2024) Discovery of a new species of kangaroo lizard (Squamata: Agamidae: Agasthyagama) from the southern Western Ghats of India. Vertebrate Zoology 74: 151-168. https://doi.org/10.3897/vz.74.e113084
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Abstract
We describe a new species of Agasthyagama from Idukki district, Kerala, India. The new species is distinguished from its sister species Agasthyagama beddomii by a combination of scale characters and are also genetically different from each other with 11% uncorrected pairwise difference in ND2 gene and 3% in 16S gene. The two species are also geographically separated, the closest distributional records are approximately 80 km apart.
Agamid, endemic, evergreen forest, Kerala, southern India, Tamil Nadu, terrestrial
Terrestrial agamids from the forests of southern India and Sri Lanka are now classified into two separate genera, Agasthyagama
Agasthyagama beddomii was originally described based on a series of five specimens (four at NHM, London and one at
Our recent fieldwork in the southern Western Ghats north of the known region of A. beddomii resulted in finding a new population from the mid-elevations in the Idukki region of the Periyar river basin. We examined museum specimens, including the type series, and newly collected specimens of A. beddomii from across its distributional range, spanning from low to high elevations. We also obtained mitochondrial 16S and ND2 genetic data from the freshly collected specimens from the Idukki population. Our analyses revealed significant, and consistent morphological and genetic differences between the two populations. Additionally, we herein designate a lectotype and provide a redescription and diagnosis for A. beddomii. Further, based on the results of the morphological and molecular analyses, we describe the Idukki population as a new species.
We generated DNA sequences for two specimens of Agasthyagama viz,
We amplified partial sequences of two mitochondrial 16S (1029 bp) and ND2 (464 bp) genes. PCR amplification for both markers was done following the existing primers and protocols (ND2: MetF1 (Forward) and H5934 (Reverse) (
Bidirectional sequences were manually checked using the CHROMAS 2.6.6 software (http://technelysium.com.au/wp/chromas) and aligned using ClustalW (
The dataset was partitioned by gene and codon positions using PartitionFinder v2 (
Morphometric measurements (in millimetres) were taken with a digital caliper to the nearest 0.1 mm, with the aid of a dissecting microscope. Morphometric and meristic characters collected in this study are as follows: Head length (HL) measured from tip of snout to mandible, head width (HW) at its widest point, head height (HH) at its highest point, interorbital distance (IO) at the anterior most point between the eyes, jaw length (JL) at tip of snout to end of jaw, naris to eye distance (NE) from posterior point of nostril to anterior point of orbit, snout to orbit distance (SO) snout tip to anterior point orbit, snout-width (SW) outermost edges of the rostrum, orbit diameter (OD) maximum diameter of the orbit, finger and toe lengths measured from the joint of the adjacent finger; 3rd finger length (3FL) excluding claw, 4th finger length (4FL) excluding claw, 4th toe length (4TL) excluding claw, 5th toe length (5TL) excluding claw, femur length (FL) length of femur from groin to knee, Crus length (CL) length of crus/tibia from knee to heel, heel length (HeL) base of palm to distal most point of the fourth toe, lower arm length (LAL) distance from elbow to proximal end of the wrist or just the underside of the forefoot, upper arm length (UAL) distance from anterior insertion of forelimb to elbow, palm length (PL) base of palm to distal most point of forelimb. snout-vent length (SVL), tail length (TL), tail width (TW) maximum tail width, taken posterior to the vent, trunk length (TrL) measured from axilla to groin.
Mid body scales (MBS) circummarginal scale rows at mid body length, dorsal scales (DS) counted from behind occiput to before cloacal ending, abdominal ventral scales (AVEN) number of scales on abdomen after dewlap till vent, dewlap ventral (DVEN) number of scales from mentum to last dewlap scale, ventral scales (VS) number of scales from mentum till vent, supralabials (SL) number of SL scales, infralabials (IL) number of IL scales.
Catalogue numbers of reported specimens bear the institutional prefix
Both ML and BI analyses recovered similar tree topologies. Agasthyagama and Otocryptis were recovered as paraphyletic with the former being the basal to the clade containing Otocryptis + Sitana + Sarada, as previously reported (Fig.
Maximum likelihood phylogeny for Agasthyagama and its three sister genera using the concatenated 16S and ND2 genes. Numbers on internal branches are Bayesian posterior probability/ML bootstrap support values. See Appendix 1 for data sources. Inset images of the two Agasthyagama species showing differences in throat coloration and pattern.
The uncorrected pairwise sequence divergences (p distances) are as follows. Among the sequences available, a sample of new species (
We identified a few non-overlapping meristic characters (number of dorsal scales and dewlap ventral scales) which are diagnostic characters to separate the two Agasthyagama species (see Diagnosis and comparison subsection in the new species description section). Breeding colouration on the throat of the two species are different, A. beddomii has broad dark stripe from the mentum, forming an elongated brick red circle at the throat, bordered with bright yellow scales on the outside and with a bright yellow to orange blotch in the centre. The new species have grey brown stripe from the mentum, gradually forming a brick red elongated circle with pale bluish-white scales at the centre.
Hemipenis of the two species are overall similar in shape (Fig.
Otocryptis beddomii Boulenger, 1885: 272
Otocryptis beddomii
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Otocryptis beddomi
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Otocryptis beddomei
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Agasthyagama beddomii
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Agasthyagama beddomii in life, all uncollected individuals from various localities: A adult male from Kanayar, Achankovil; B female from Mararmalai, Kanyakumari District; C male from Manalar, Achankovil; D female from Rockwood, Shendurney Wildlife Sanctuary; E male from Devermala, Achankovil; F female from Arippa, Trivandrum. Photographs A and C–F by Sandeep Das and B by Jude. D.
Four males (
The original description of Agasthyagama beddomii included mention of five specimens with measurement data for one specimen. Four of these specimens are now housed at NMHUK, London and one at
Morphometric and meristic characters for Agasthyagama beddomii examined during this study. “—” missing data, “na” character not available, “M” male and “F” female, “*” indicates an incomplete tail. Note: Some of the characters for the samples from CES were measured differently from the ones collected during this study (see methods in
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location | Head of Sevagherry Ghat | Head of Sevagherry Ghat | Head of Sevagherry Ghat | Head of Sevagherry Ghat | Head of Sevagherry Ghat | Trivandrum, Kerala, India | Trivandrum, Kerala, India | Trivandrum, Kerala, India | Trivandrum, Kerala, India | Trivandrum, Kerala, India |
Sex | F | F | M | M | F | F | F | F | F | M |
Type status | Lectotype | paralectotype | paralectotype | paralectotype | paralectotype | No | No | No | No | No |
HL | 13.9 | 11 | 10.6 | 9.3 | 9.2 | 12.2 | 13.1 | 12.1 | 13 | 11.6 |
HW | 8.6 | 7 | 6.6 | 6.5 | 7.0 | 7.7 | 8.4 | 7.8 | 8.3 | 8.4 |
HH | 7.6 | 6.5 | 6 | 5.4 | 6.2 | 6.4 | 6.9 | 6.2 | 6.7 | 7 |
IO | 5 | 4.3 | 4.5 | 4.3 | 7.1 | 4.5 | 5.4 | 4.7 | 4.9 | 5 |
JL | 10.2 | 8 | 8 | 7 | — | 9 | 10 | 9.3 | 8.6 | 10 |
NE | 3.4 | 2.3 | 3 | 2.4 | 3.7 | 2.8 | 3.2 | 2.5 | 2.7 | 2.7 |
SO | 5 | 4 | 4.3 | 3.7 | 5.4 | 4.3 | 4.9 | 3.9 | 4.4 | 4.5 |
SW | 2.6 | 1.8 | 2 | 1.9 | 2.8 | 0.9 | 1.3 | 1.1 | 1.3 | 1.2 |
OD | 4 | 3.3 | 3 | 2.7 | 2.0 | 2.9 | 2.9 | 3.1 | 3.3 | 3.2 |
3FL | 4.8 | 3.2 | 3.3 | 3.2 | 4.7 | 3.8 | 3.7 | 3.7 | 3.9 | 4.7 |
4FL | 5.14 | 3.9 | 4.1 | 3.8 | 5.3 | 4.3 | 4.2 | 4 | 4.8 | 5.1 |
4TL | 10.4 | 7 | 8 | 7.2 | 8.6 | 9.7 | 8.8 | 8.3 | 8.8 | 10.8 |
5TL | 1.74 | 1.4 | 1.1 | 1.6 | 1.5 | 1.7 | 1.8 | 1.4 | 1.6 | 1.9 |
FL | 14.7 | 11.3 | 10 | 9 | 13.2 | 12.8 | 12 | 11.7 | 12.8 | 14.5 |
CL | 15.2 | 10.9 | 12 | 9.4 | 13.1 | 14.1 | 14.5 | 12.7 | 14.7 | 14.9 |
HeL | 19.5 | 13.4 | 14.5 | 14.1 | — | 17 | 17.6 | 17.1 | 16.2 | 20.2 |
LAL | 8 | 6.3 | 6.9 | 5.1 | 6.1 | 6.8 | 7 | 6.8 | 7.7 | 7.5 |
UAL | 7.8 | 5.5 | 5.6 | 5.2 | 6.3 | 6.6 | 7 | 6.4 | 7.5 | 6.9 |
PL | 7.9 | 5.2 | 6.1 | 6 | — | 6.9 | 6.8 | 6.5 | 6.4 | 7.1 |
SVL | 44.7 | 31.3 | 31 | 28.5 | 40.6 | 39.5 | 43.6 | 38.5 | 41.7 | 41.7 |
TL | 72.7 | 38 | 53 | 53 | — | 60.3 | 66 | 25* | 59.9 | 72.2 |
TW | 3.7 | 3.8 | 3 | 2.7 | — | 4.9 | 4.6 | 3.8 | 3 | 4.3 |
TrL | 19.3 | 11.9 | 11.2 | 13 | 18.4 | 18.1 | 21 | 15.9 | 19.6 | 14.4 |
MBS | 79 | 78 | 74 | 75 | 66 | 78 | 80 | 75 | 65 | 85 |
DS | 67 | 65 | 62 | 62 | — | 65 | 65 | 60 | 61 | 60 |
AVEN | na | na | 43 | 40 | na | na | na | na | na | 39 |
DVEN | na | na | 40 | 42 | na | na | na | na | na | 37 |
VS | 78 | 79 | 83 | 82 | 84 | 74 | 79 | 70 | 74 | 76 |
SL (left,right) | 10,11 | 9,10 | 9,9 | 9,10 | — | 9,9 | 9,9 | 9,9 | 10,9 | 9,9 |
IL (left,right) | 11,11 | 9,9 | 9,10 | 9,10 | — | 9,10 | 11,10 | 9,10 | 10,10 | 10,9 |
Morphometric and meristic characters for Agasthyagama beddomii examined during this study. “—” missing data, “na” character not available, “M” male and “F” female, “*” indicates an incomplete tail. Note: Some of the characters for the samples from CES were measured differently from the ones collected during this study (see methods in
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3221 |
CESL025 | CESL099 | CESL268 | CESL703 |
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location | Trivandrum, Kerala, India | Trivandrum, Kerala, India | Trivandrum, Kerala, India | Shendurney, Kerala, India | Shendurney, Kerala, India | Peppara WLS, Kerala, India | Peppara WLS, Kerala, India | Achankovil, Kerala, India | Peppara WLS, Kerala, India |
Sex | M | M | M | M | M | F | M | M | M |
Type status | No | No | No | No | No | No | No | No | No |
HL | 12.2 | 12.9 | 12.7 | 11.3 | 11.6 | 8.8 | 9.1 | 8.9 | 8.7 |
HW | 7.6 | 7.7 | 8.0 | 7.4 | 7.5 | 9.0 | 7.2 | 8.2 | 8 |
HH | 6.5 | 6.4 | 6.6 | 6.4 | 6.5 | 8.1 | 6.7 | 7.4 | 7.1 |
IO | 4.4 | 5.0 | 4.7 | 4.8 | 4.6 | 6.0 | 5.1 | 5.6 | 5.8 |
JL | 9.4 | 9.5 | 9.8 | 8.1 | 8.4 | 13.2 | 12.7 | 12.5 | 12.7 |
NE | 2.6 | 2.8 | 2.8 | 2.9 | 2.8 | 3.7 | 3.4 | 3.6 | 3.5 |
SO | 4.4 | 4.6 | 4.5 | 4.5 | 4.6 | 5.3 | 5.2 | 5.4 | 5.3 |
SW | 1.1 | 1.3 | 1.3 | 2.2 | 2.4 | — | — | — | — |
OD | 3.4 | 3.5 | 3.4 | 3.2 | 2.9 | 3.8 | 3.7 | 3.8 | 4.1 |
3FL | 3.7 | 4.2 | 4.1 | 3.9 | 3.3 | 4.3 | 3.9 | 4.1 | 4 |
4FL | 4.4 | 4.7 | 4.5 | 4.2 | 3.9 | 5 | 4.8 | 5.2 | 4.9 |
4TL | 9 | 11.1 | 10.9 | 9.6 | 9.3 | 10.8 | 9.5 | 9.9 | 10.4 |
5TL | 1.7 | 2 | 1.5 | 1.4 | 1.6 | 2.3 | 2 | 2.3 | 2.5 |
FL | 14.5 | 12.9 | 13.7 | 11.9 | 11.7 | 13.2 | 13.8 | 13.1 | 14.2 |
CL | 14.7 | 15.6 | 16 | 13 | 12.5 | 12.4 | 12.8 | 12.9 | 13.6 |
HeL | 17.4 | 18.9 | 18 | 17.7 | 17.2 | 16.7 | 16.1 | 16.1 | 17.1 |
LAL | 7.4 | 7.4 | 7.2 | 6.9 | 6.7 | 8 | 7 | 7.3 | 7.3 |
UAL | 7 | 7.5 | 7.5 | 6.2 | 6.6 | 7.3 | 6 | 7 | 6.7 |
PL | 6.5 | 7 | 7 | 6.5 | 6.4 | 6.8 | 6 | 6.7 | 6.9 |
SVL | 38.9 | 42.7 | 41.6 | 35.4 | 34.3 | 37.9 | 38.1 | 37.2 | 40.1 |
TL | 63.2 | 66.4 | 41* | 40* | 53* | 38 | 53 | 28* | 66 |
TW | 4.1 | 2.9 | 3.3 | 3.8 | 3.4 | 3.8 | 5.3 | 4.9 | 4.7 |
TrL | 15.4 | 18.2 | 15.5 | 12.7 | 12.2 | 15.6 | 16 | 14.8 | 14.8 |
MBS | 87 | 72 | 75 | 74 | 73 | 81 | 81 | 77 | 77 |
DS | 62 | 65 | 63 | 62 | 61 | 63 | 63 | 63 | 63 |
AVEN | 45 | 38 | 38 | 46 | 47 | na | — | — | — |
DVEN | 44 | 39 | 37 | 41 | 39 | na | — | — | — |
VS | 89 | 77 | 75 | 87 | 86 | 71 | 74 | 78 | 73 |
SL (left,right) | 9,9 | 11,11 | 9,10 | 10,10 | 10,9 | 9,9 | 10,10 | 11,10 | 10,11 |
IL (left,right) | 10,10 | 12,12 | 10,10 | 11,11 | 10,9 | 9,10 | 10,11 | 11,10 | 11,10 |
The freshly collected specimens from Shendurney are morphologically the same as those of the type series in NHM, London and the one in
A small-sized agamid lizard, SVL 29–44.7 mm (n = 19), characterised by laterally compressed body with heterogenous dorsolateral scales, small overlapping scales with larger often trihedral scales; 65–87 rows of scales around midbody; head with unequal keeled scales, a small antehumeral pit present, tympanum concealed; nuchal and dorsal crests absent, 60–67 dorsal scales from behind occiput to above cloacal ending; ventral scales strongly keeled, larger than lateral scales, 71–89 ventrals from mentum to cloaca; males with a small dewlap from mentum to forelimb insertion, gular scales small, keeled, 37–44 scales from mentum to last dewlap scale in males; limbs slender, covered with larger keeled scales; 4th digit on pes much longer than others, 5th digit on pes much reduced. Uniform olive to brown body, with lighter enlarged scales laterally; breeding coloration of males with pale grey to white mid dorsum; white throat with a broad dark brown stripe on dewlap with brick red circle bordered with bright yellow scales on the outside and with a bright yellow to orange blotch at the centre.
Overall body pale grey to white with patches of light brown to amber on the snout and posterior part of head; dorsum with pale amber; tail dorsally and ventrally light brown, blotches, prominent laterally; limbs and tail dull brown speckled with light grey to white markings ventrally from gular region to abdomen pale white.
Agasthyagama beddomii has a wide distribution (Fig.
There are no previous records of Agasthyagama from the mountains in Idukki district. Sivagiri hills according to a map provided by
The species is named after the Zoological Society of London’s EDGE of Existence Program who supported SD and RKP, and several early career conservation researchers across the globe in their projects on evolutionarily distinct species. EDGE is an acronym for Evolutionarily Distinct and Globally Endangered. The specific epithet “edge” is a patronym as a noun in apposition. We suggest common name “northern kangaroo lizard” and വടകൻ കംഗാരു ഒാന്ത് (vadakan kangaroo oanth) as a regional Malayalam name.
A small-sized agamid (SVL 30–42.5 mm; n = 11) lizard characterised by the presence of heterogenous dorsolateral scales, oriented backwards, small overlapping scales with larger often trihedral scales; larger scales roughly forming 5 or 6 chevron shaped ridges on mid dorsum from nuchal region to above cloaca; strongly keeled enlarged scales randomly scattered laterally, 76–82 rows of scales around midbody; head with unequal keeled scales, supraciliary edge sharp; a small antehumeral pit present, tympanum concealed; nuchal and dorsal crests absent; ventral scales strongly keeled, larger than lateral scales, 73–80 ventrals from mentum to cloaca; gular scales at the mid-line nearly equal to the adjacent scales; males with a small dewlap, 32–35 scales from mentum to last dewlap scale; limbs slender, covered with larger keeled scales; 4th digit on pes much longer than others, 5th digit on pes much reduced. Uniform olive-brown body, with lighter, enlarged scales laterally, mid dorsum paler; breeding males with pale peach to grey mid dorsum; dewlap in breeding males with pale bluish-white centre flanked by reddish-brown stripe.
Agasthyagama edge sp. nov. is the second species from the recently recognised genus Agasthyagama. It is superficially similar to A. beddomii in overall shape, size and colour but can be distinguished by combination of the following characters: 49–58 dorsal scales from behind occiput to above cloacal ending (vs. 60–67 dorsal scales in A. beddomii) and 32–35 dewlap ventral scales in males (vs. 37–44 dewlap ventral scales in males of A. beddomii). Additionally, dewlap stripe in breeding males of A. edge sp. nov. grey brown from mentum, gradually forming a brick-red elongated circle with pale bluish-white scales at the centre (vs. darker stripe with brick-red circle bordered with bright yellow scales on the outside and with a bright yellow to orange blotch at the centre in breeding males of A. beddomii).
The holotype is generally in good condition; hemipenis everted, exposed and visible on both sides when viewed dorsally (Fig.
Morphometric and meristic characters for Agasthyagama edge sp. nov. examined during this study. “_” missing data, “na” character not available, “M” male and “F” female. Samples (voucher no.) All specimens collected from Idukki district, Kerala.
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BNHS3222 |
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Sex | M | F | M | M | M | M | M | M | M | M | M |
Type status |
Holotype | Paratype | Paratype | Paratype | Paratype | Paratype | Paratype | Paratype | Paratype | Paratype | Paratype |
HL | 12.8 | 11.3 | 11.8 | 11.4 | 12 | 12.5 | 12.1 | 11.5 | 10.6 | 10.7 | 10.4 |
HW | 8.1 | 7.3 | 7.0 | 7.3 | 7.4 | 7.4 | 7.5 | 7.4 | 6.9 | 7.0 | 6.6 |
HH | 7.4 | 6.4 | 6.7 | 6.8 | 6.9 | 7.1 | 6.9 | 6.4 | 5.9 | 5.8 | 5.6 |
IO | 5.4 | 4.3 | 4.2 | 4.5 | 4.9 | 4.8 | 5,5 | 4.4 | 3.8 | 4.0 | 3.7 |
JL | 9.6 | 8 | 8.5 | 8.6 | 8.5 | 8.9 | 9.3 | 8.5 | 7.3 | 8.1 | 7.4 |
NE | 4.2 | 3 | 2.9 | 2.7 | 3.0 | 3.2 | 3.3 | 2.8 | 2.6 | 2.9 | 3.0 |
SO | 5.5 | 3.9 | 4.2 | 4.4 | 4.4 | 4.2 | 4.6 | 4.2 | 3.2 | 3.5 | 3.7 |
SW | 2.9 | 2.4 | 2.4 | 2.4 | 2.6 | 2.8 | 2.7 | 2.6 | 1.9 | 2.2 | 1.8 |
OD | 4.0 | 3.3 | 2.8 | 3.4 | 3.4 | 3.7 | 3.6 | 3.4 | 2.9 | 3.0 | 2.5 |
3FL | 5.3 | 3.7 | 3.8 | 3.7 | 4.1 | 4.3 | 4.3 | 3.8 | 3.0 | 4.2 | 2.9 |
4FL | 6.5 | 3.9 | 4.4 | 4.3 | 4.9 | 4.7 | 4.8 | 4.1 | 3.6 | 4.5 | 3.2 |
4TL | 10.9 | 9.3 | 10.2 | 9.9 | 9.8 | 9.7 | 10 | 9.8 | 9.0 | 10.1 | 7.9 |
5TL | 2.3 | 1.8 | 1.5 | 1.6 | 1.8 | 2.0 | 2.1 | 1.9 | 1.5 | 1.9 | 1.4 |
FL | 13.6 | 11.1 | 11.5 | 11.3 | 13.0 | 13.4 | 12.9 | 11.8 | 10.8 | 10.4 | 9.9 |
CL | 14.1 | 11.6 | 12.8 | 12.4 | 12.8 | 14.0 | 13.6 | 12.6 | 11.0 | 10.8 | 10.5 |
HeL | 19.6 | 15.3 | 16.6 | 16.5 | 17.8 | 18.4 | 18.4 | 15.9 | 14.8 | 15.2 | 14.3 |
LAL | 7.6 | 7.0 | 5.8 | 6.2 | 7.0 | 7.7 | 7.5 | 6.9 | 6.0 | 6.3 | 5.7 |
UAL | 7.1 | 6.1 | 5.2 | 6 | 6.3 | 6.8 | 6.9 | 5.8 | 5.7 | 5.9 | 5.6 |
PL | 7.5 | 5.3 | 5.6 | 6.4 | 5.9 | 6.7 | 6.6 | 5.8 | 5.8 | 5.8 | 5.0 |
SVL | 42.5 | 33.7 | 34.8 | 36.2 | 38.2 | 40.3 | 41.1 | 35.4 | 31 | 33 | 30 |
TL | 78.9 | 59.8 | 64.2 | 68.4 | 70.6 | 70.4 | 72.2 | 62.9 | 59.7 | 58.3 | 54.5 |
TW | 5.3 | 2.6 | 3.5 | 3.4 | 4.1 | 4.3 | 4.3 | 3.7 | 3.1 | 4.2 | 3.0 |
TrL | 16.8 | 14.8 | 13.9 | 15.8 | 15.8 | 16.1 | 16.6 | 14.5 | 12.6 | 15.0 | 11.7 |
MBS | 79 | 76 | 79 | 78 | 77 | 80 | 76 | 79 | 82 | 78 | 77 |
DS | 53 | 57 | 49 | 55 | 51 | 58 | 51 | 56 | 51 | 54 | 56 |
AVEN | 40 | na | 41 | 45 | 43 | 45 | 44 | 48 | 43 | 41 | 46 |
DVEN | 34 | na | 32 | 33 | 35 | 34 | 32 | 32 | 35 | 35 | 34 |
VS | 74 | 78 | 73 | 78 | 78 | 79 | 76 | 80 | 78 | 76 | 80 |
SL (left,right) | 8,9 | 10,10 | 10, 10 | 10,10 | 9,9 | 10,9 | 9,9 | 10,10 | 9,10 | 9,9 | 10,10 |
IL (left,right) | 10,10 | 10,10 | 9, 8 | 9,10 | 10,9 | 9,10 | 10,10 | 10,9 | 9,9 | 10,9 | 9,10 |
Uniform dull olive-brown body with slightly darker head, few light and darker enlarged scales scattered laterally; mid dorsum paler, forming a broad pale peach band from behind the head continuing till above tail, flanked by a thin almost broken stripe, most prominent above shoulder and above groin where it turns orangish (Fig.
Entire dorsal surface of the body from the back of the head extending onto the tail, between the dorsolateral keels is pale creamy white, dorsal surface of the head pale brown, supraorbital stripe distinct. Lateral surface of head pale brown followed by darker brown marking below eye, narrow stripe from posterior end of eye distinct, pale creamy white. Body laterally uniform dark brown, speckled with few light grey to white scales. Limbs pale grey with darker blotched towards the digits. Abdomen, underside of limbs and tail dirty white intermixed with darker scales. Throat stripe brown with pale creamy white scales at the centre. Scales adjacent to the stripe buff to creamy white.
Morphometric and meristic data for the type specimens is presented in Table 1. The adult paratypes include nine male specimens ranging from 30–41.1 mm in SVL and one female specimen (
Agasthyagama edge sp. nov. is currently known only from the type locality and its vicinity and appears to be relatively common in the type locality (Fig.
The discovery of a second species of Agasthyagama adds to the ever-increasing reptile diversity in the Western Ghats. In the past decade, four species (Monilesaurus acanthocephalus
Among the agamids in the Western Ghats, Agasthyagama and Microauris
It’s also intriguing that the newly described population of Agasthyagama edge sp. nov. has never been reported from this region before, especially considering that these areas were relatively well explored during the colonial era (
We follow the evolutionary species concept to delimit the monophyletic lineage of Agasthyagama from Idukki district, Kerala as a distinct species (
We thank the Kerala Forest Department for permits (WL 10-4950/2014 Dated 31.12.2020) and support. We thank the National Geographic grant (NGS-63816R-19) for the support for fieldwork and lab work and David Gower for his support in this project. SD’s contribution is supported by SERB NPDF program (PDF/2022/003674). SD and RKP thanks EDGE of Existence program for the support on their conservation research projects. VD’s contribution was supported in part by a Humboldt fellowship. VD thanks Uwe Fritz for his support. VD thanks Rachunliu Kamei, Josh Mata and Sara Ruane for their support at
Tables S1, S2
Data type: .zip
Explanation notes: Table S1. Gazetteer of confirmed locality records for Agasthyagama beddomii and Agasthyagama edge sp. nov. — Table S2. GenBank voucher numbers for the samples used in the study.