Vertebrate Zoology 70(3): 417-433, doi: 10.26049/VZ70-3-2020-11
A new miniature species of Priocharax (Teleostei: Characiformes: Characidae) from the Rio Madeira drainage, Brazil, with comments on the adipose fin in characiforms
George Mattox‡, Camila S. Souza, Mônica Toledo-Piza, Ralf Britz, Claudio Oliveira‡ Universidade Federal de São Carlos, Sorocaba, Brazil
Corresponding author: George Mattox ( gmattox@ufscar.br ) © George Mattox, Camila Souza, Mônica Toledo-Piza, Ralf Britz, Claudio Oliveira. This article is freely available under the J.UCS Open Content License. Citation:
Mattox G, Souza CS, Toledo-Piza M, Britz R, Oliveira C (2020) A new miniature species of Priocharax (Teleostei: Characiformes: Characidae) from the Rio Madeira drainage, Brazil, with comments on the adipose fin in characiforms. Vertebrate Zoology 70(3): 417-433. https://doi.org/10.26049/VZ70-3-2020-11 |  |
Abstract
A new miniature species of the freshwater fish genus Priocharax is described from the Rio Jamari, Rio Madeira drainage, Amazon basin. Priocharax varii sp. n. is the fourth species currently recognized in the genus and shares with the other three the presence of a conspicuous larval pectoral fin in adults, a fully toothed maxilla, a triangular pseudotympanum situated anterior to the fifth vertebra and a tiny size combined with a translucent body. The new species is diagnosed from congeners in having an adipose fin, a unique feature within Priocharax . Molecular identification of the new species and the other valid Priocharax species supports the morphological findings. A brief discussion on the presence/absence of the adipose fin in Characiformes is provided.
Keywords
Amazon River basin, barcoding, biodiversity, osteology, taxonomy