A new miniature species of Priocharax (Teleostei: Characiformes: Characidae) from the Rio Madeira drainage, Brazil, with comments on the adipose fin in characiforms

Title: A new miniature species of Priocharax (Teleostei: Characiformes: Characidae) from the Rio Madeira drainage, Brazil, with comments on the adipose fin in characiforms

Creators: George M. T. Mattox, Camila S. Souza, Mônica Toledo-Piza, Ralf Britz
& Claudio Oliveira

Submitted June 5, 2020.
Accepted July 24, 2020.
Published online at www.senckenberg.de/vertebrate-zoology on August 11, 2020.
Published in print Q3/2020.

DOI: 10.26049/VZ70-3-2020-11
PDF/A 5 MB

Published by Senckenberg Gesellschaft für Naturforschung

Date (Publication Year): 2020

Resource Type (General): TEXT

Resource Type (optional): Vertebrate Zoology, Scientific Article

Description (en): 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.

Key words: Amazon River basin, barcoding, biodiversity, osteology, taxonomy.

Citation: Mattox, G. M. T., Souza, C. S., 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