Dorsolateral head muscles of the catfish families Nematogenyidae and Trichomycteridae (Siluriformes: Loricarioidei): comparative anatomy and phylogenetic analysis

Autor(es)

Datovo, Alessio ^[1] ; Bockmann, Flavio Alicino ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biol, Lab Ictiol Ribeirao Preto, FFCLRP, Programa Posgrad Biol Comparada, BR-14040901 Ribeirao Preto, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Neotropical Ichthyology; v. 8, n. 2, p. 193-246, APR-JUN 2010.
• Citações Web of Science: 64

Resumo

The skeletal muscles of the dorsolateral region of the head of the Nematogenyidae and representatives of the all major clades of the Trichomycteridae are described and illustrated. A hypothesis on the phylogenetic relationships among these taxa exclusively based on the surveyed musculature is presented. The single most parsimonious cladogram obtained from the phylogenetic analysis of the 36 myological characters gathered and 35 terminal-taxa mostly agrees with the previous hypotheses of trichomycterid intrarelationships. The Copionodontinae and Trichogeninae form a monophyletic lineage that is the sister-group to all remaining trichomycterids. The monophyly of the clades formed by Glanapteryginae plus Sarcoglanidinae; Stegophilinae plus Tridentinae plus Vandelliinae; and the assemblage comprising all of these five subfamilies (TSVSG clade) is corroborated. Two of our findings are, however, discordant with the previous prevailing hypotheses: the sister-group relationship among Tridentinae and Stegophilinae and the monophyly of the Trichomycterinae lato sensu, i. e., including the genera Scleronema and Ituglanis. In addition, the previously proposed osteological synapomorphies supporting the close affinities of Scleronema and Ituglanis with the TSVSG clade were revised, revealing that they are either invalid or ambiguous. Most of the synapomorphies herein proposed are homoplasy-free, with some of them corroborating the monophyly of weakly-supported groups, such as Stegophilinae. (AU)

• Processo FAPESP: 04/09219-6 - Relações filogenéticas em Characidae (Ostariophysi: Characiformes)
• Beneficiário: Ricardo Macedo Corrêa e Castro
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 04/05425-0 - Descricao da miologia cefalica de nematogenyidae e trichomycteridae (siluriformes, loricarioidea) e suas implicacoes filogeneticas.
• Beneficiário: Aléssio Datovo da Silva
• Modalidade de apoio: Bolsas no Brasil - Mestrado