Sistemática do gênero Ageneiosus La Cépède (Siluriformes Auchenipteridae)
The catfish genus Ageneiosus is revised and a new hypothesis of phylogenetic relationships inter- and intra-generic is proposed. The taxonomic revision was based on the examination of available type specimens and analysis to the original descriptions. Taxonomic accuracy of the species was tested...
| Autor principal: | Ribeiro, Frank Raynner Vasconcelos |
|---|---|
| Grau: | Tese |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11470 http://lattes.cnpq.br/8596465020613445 |
| Resumo: |
|---|
|
The catfish genus Ageneiosus is revised and a new hypothesis of phylogenetic
relationships inter- and intra-generic is proposed. The taxonomic revision was based on the
examination of available type specimens and analysis to the original descriptions. Taxonomic
accuracy of the species was tested by morphometric, meristic and qualitative analyses of
internal and external anatomy. Valid species were considered in the study of phylogenetic
relationships. The phylogenetic analysis included 239 characters coded for 41 terminal taxa.
Formerly with 12 species, the genus Ageneiosus comprises currently 19 species recognized
herein as valid, some of which are widely distributed across large rivers in South America.
Ageneiosus pardalis is the only trans-Andean species in the genus. Ageneiosus marmoratus is
a junior synonym of Ageneiosus inermis. Ageneiosus dentatus and Ageneiosus rondoni are
valid species and their names are removed from the synonymy of Ageneiosus ucayalensis and
Ageneiosus brevis, respectively. Six new species are recognized. The parsimony analysis
resulted in a single most parsimonious tree with 631 steps, consistency index 0.52 and
retention index 0.85. The monophyly of Ageneiosus is corroborated and its diagnosis includes
10 synapomorphic characters unique between the Auchenipteridae. The genus is composed of
two main clades: (1) clade comprising the majority of the species with large and not ossified
swimbladder and (2) clade comprising Ageneiosus pardalis and the species with reduced and
ossified swimbladder in large individuals. The ressurrection of Tympanopleura is proposed to
accommodate the species of the first clade. According to the hypothesis presented here, the
clade Ageneiosus-Tympanopleura is the sister-group of Tetranematichthys and the clade
composed of these genera is the sister-group of (Entomocorus (Auchenipterus (Epapterus,
Pseudepapterus))). A key for all nineteen valid species of Ageneiosus species is provided. |