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| Author(s): |
José Luís Olivan Birindelli
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Biociências (IBIOC/SB) |
| Defense date: | 2010-08-27 |
| Examining board members: |
Heraldo Antonio Britski;
Alberto Akama;
Marcelo Ribeiro de Britto;
Naercio Aquino Menezes;
Mario Cesar Cardoso de Pinna
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| Advisor: | Heraldo Antonio Britski |
| Abstract | |
The superfamily Doradoidea (Siluriformes) is composed of two Neotropicalendemic families: Doradidae and Auchenipteridae. The sister-group relationship between these families has been corroborated by previous studies of both morphological and molecular data. Previous studies have also provided support for evolutionary relationships between doradoid genera and species. However, relationships between the superfamily Doradoidea and remaining Siluriformes, and between several genera of Doradidae and Auchenipteridae remain controversial. The aim of my study is to recover evolutionary relationships between genera and species of the superfamily Doradoidea, and to find support for its position within Siluriformes. To accomplish this, I performed a comprehensive phylogenetic analysis including a majority of the Doradidae species, 21 of 22 genera of Auchenipteridae, and representatives of another 16 families of Siluriformes. For each of these taxa, I described, illustrated, or discussed 328 characters, most of which were gathered from several previous studies by other authors. Parsimony analysis of these characters resulted in four equally parsimonious trees with 1086 steps. In all trees, the superfamily Doradoidea was recovered as sister to the Africa-endemic family Mochokidae, together forming the suborder Doradoidei. Monophylies of the superfamily Doradoidea and suborder Doradoidei were respectively corroborated by nine and five exclusive synapomorphies. Six non-exclusive synapomorphies supported Doradoidei as sister to a clade composed of the Africa-endemic Amphiliidae and the Asia/Neotropical-endemic Sisoroidea. Monophylies of the families Auchenipteridae and Doradidae were also corroborated by sets of five and three characters, respectively. The family Auchenipteridae was found to be composed of two subfamilies: Centromochlinae and Auchenipterinae, the latter comprising five genera (Asterophysus, Liosomadoras, Tocantinsia, (Pseudotatia, Pseudauchenipterus)), and two related tribes: Auchenipterini and Trachelyopterini. Wertheimeria and Kalyptodoras were recovered together as a clade sister to all other doradids; and Franciscodoras was recovered as the second basal-most lineage of the family. The genera Acanthodoras and Agamyxis were recovered within the species of the subfamily Astrodoradinae. Platydoras and Centrochir were recovered as sister to the subfamily Doradinae, which comprised three tribes: Pterodoradini, Rhinodoradini and Doradini. Oxydoras was recovered as sister to all fimbriate-barbeled doradids. The genus Hemidoras was considered a junior synonym of Opsodoras. The species Nemadoras leporhinus, N. trimaculatus and Opsodoras ternetzi were recovered as more closely related to Hassar, Anduzedoras and Leptodoras, than to their congeners. A systematic summary with diagnoses of every genus, tribe, subfamily, and family of the superfamily Doradoidea is provided, as well as an artificial key allowing identification of all genera of the group. (AU) | |