A new species of Diapoma (Characiformes, Characidae, Stevardiinae) from the Rio Paraná basin, with an identification key to the species of the genus

Authors
Vanegas Rios, James Anyelo; Azpelicueta, Maria de Las M.; Malabarba, Luiz R.
Publication Year
2018
Language
English
Format
article
Status
Published version
Description
Diapoma nandi is described from the Piray-Miní stream, a tributary of the Rio Paraná in Argentina. It is characterized among the Stevardiinae by having a terminal mouth, two unbranched and eight branched dorsal-fin rays, one unbranched and six branched pelvic-fin rays and the absence of a caudal-fin organ and is distinguished from all congeners by the following combination of characters: unmodified scales on the lower caudal-fin lobe, lack of enlarged opercle and subopercle, incomplete lateral line, hyaline adipose fin, anal-fin distal border straight or slightly convex in adult males, large tricuspid teeth on anterior region of the dentary, distal arrangements of the anal-fin bony hooks in adult males, middle caudal-fin rays lacking large round blotch and several morphometric variables associated with body shape. Additionally, we conducted a morphometric comparison focused on the congeners that co-occur in the Paraná basin.
Fil: Vanegas Rios, James Anyelo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Zoología de Vertebrados; Argentina
Fil: Azpelicueta, Maria de Las M.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Zoología de Vertebrados; Argentina
Fil: Malabarba, Luiz R.. Universidade Federal do Rio Grande do Sul; Brasil
Subject
ENDEMIC SPECIES
NEOTROPICAL FRESHWATER FISH
PIRAY-MINI STREAM
SEXUAL DIMORPHISM
STEVARDIINAE
Zoología, Ornitología, Entomología, Etología
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Conservación de la Biodiversidad
Ciencias Biológicas
CIENCIAS NATURALES Y EXACTAS
Access level
Restricted access
License
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repository
CONICET Digital (CONICET)
Institution
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identifier
oai:ri.conicet.gov.ar:11336/81689