info:eu-repo/semantics/article
Phylogeny of the neotropical genus gephyrocharax (characiformes: Characidae: Stevardiinae), with remarks on the tribe stevardiini
Fecha
2018-03Registro en:
Vanegas Rios, James Anyelo; Phylogeny of the neotropical genus gephyrocharax (characiformes: Characidae: Stevardiinae), with remarks on the tribe stevardiini; Wiley Blackwell Publishing, Inc; Zoological Journal of the Linnean Society; 182; 4; 3-2018; 808-829
0024-4082
1096-3642
CONICET Digital
CONICET
Autor
Vanegas Rios, James Anyelo
Resumen
Stevardiinae, which consists of 326 species and 44 genera, is a monophyletic subfamily within the family Characidae. In a recent classification of the subfamily, the tribe Stevardiini was expanded from three (Corynopoma, Gephyrocharax and Pterobrycon) to six genera by the addition of Chrysobrycon, Hysteronotus and Pseudocorynopoma. However, no morphological evidence has supported this definition of the tribe and the monophyly of Gephyrocharax. To address these issues, a phylogenetic study of most stevardiins focusing on Gephyrocharax was conducted. A data matrix including 532 characters and 213 taxa (73 stevardiines, 19 of which were stevardiins) was processed using maximum parsimony in TNT 1.5. All characters were analysed under extended implied weighting, exploring 21 k values. A strict consensus (comprising the most stables trees obtained) was used as the final topology. The results support the current definition of Stevardiini, as well as the monophyly of Chrysobrycon, Gephyrocharax and Pterobrycon. Corynopoma was obtained as the sister group of Gephyrocharax, the latter being phylogenetically diagnosed by two synapomorphies associated with caudal-fin morphology of adult males. The following interspecific relationships within Gephyrocharax are hypothesised: (G. martae ((G. chocoensis (G. major (G. atracaudatus, G. intermedius))) (G. venezuelae (G. sinuensis (G. Valencia (G. caucanus (G. melanocheir, G. torresi)))))))).