title: Molecular phylogeny of the Neotropical fish genus Tetragonopterus (Teleostei: Characiformes: Characidae).
abstract: Tetragonopterinae encompasses characid species of the genus Tetragonopterus, which are widely distributed throughout east of the Andes in South America. While taxonomy has recently clarified the species diversity and molecular evidence strongly supports the monophyly of Tetragonopterus, no interspecific relationship studies are currently available. Here we used a large molecular dataset composed of two mitochondrial and three nuclear loci containing an extensive taxon sampling within the family Characidae and included eleven species of Tetragonopterus to generate the first time-calibrated phylogeny for Tetragonopterinae. Our results support monophyly of the subfamily represented solely by Tetragonopterus and corroborate previous molecular hypothesis of close relationship with Exodon plus Roeboexodon and the subfamily Characinae. Internally, we found Moenkhausia georgiae as sister species to all remaining species followed by T. rarus, being both species endemic to the Guiana Shield drainages. Species-level relationships are first hypothesized and putative morphological apomorphies are discussed as support to monophyletic clades. Our time-calibrated phylogeny suggested an origin of the genus during the Late Oligocene-Early Miocene. We hypothesized that the Andean geological activity followed by transformations in the Amazonian hydrographic scenario during the Miocene may have promoted most of the lineage diversification within the Tetragonopterus.
authors.affiliation: Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil. Electronic address: melo@ibb.unesp.br.
authors.forename: Bruno F
authors.initials: BF
authors.lastname: Melo
authors.affiliation: Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil.
authors.forename: Ricardo C
authors.initials: RC
authors.lastname: Benine
authors.affiliation: Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil.
authors.forename: Gabriel S C
authors.initials: GSC
authors.lastname: Silva
authors.affiliation: Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil.
authors.forename: Gleisy S
authors.initials: GS
authors.lastname: Avelino
authors.affiliation: Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil.
authors.forename: Claudio
authors.initials: C
authors.lastname: Oliveira
mesh_terms: D000818:Animals; D060126:Characidae / Q000145:classification* / Q000235:genetics; D004272:DNA, Mitochondrial; D019143:Evolution, Molecular; D058889:Molecular Typing; D010802:Phylogeny
chemical_list: D004272:DNA, Mitochondrial
keywords: Amazon; Freshwater fishes; Historical biogeography; Multilocus analysis; Tetragonopterinae