MORFOLOGIA COMPARADA DA CINTURA PÉLVICA DE REPRESENTANTES DA SUPERFAMÍLIA LORICARIOIDEA (OSTARIOPHYSI; SILURIFORMES)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The morphology of the pelvic girdle is compared throughout the six families of Loricarioidea. Representatives of the families were: Nematogenyidae (1 species), Trichomycteridae (7 species), Callichthyidae (6 species), Scoloplacidae (2 species), Astroblepidae (1 species) and Loricariidae (8 species). All families showed synapomorphies on the pelvic girdle. Nematogenyidae has a laminar extension on the basipterygium and cartilages on the 1st and 2nd pelvic rays; Trichomycteridae, besides showing a large diversity of shapes of pelvics, have structures such as fused cartilage, very long internal anterior processes and posterior cartilage on basipterygium; Callichthyidae showed a very peculiar shape of pelvic girdle but very conservative throughout the family, and some features like a unique conexion of the pelvics with the axial skeleton, strong tridimensional shape of the basipterygium and external anterior processes modified; Scoloplacidae also showed a very peculiar and conservative pelvic girdle, without anterior or posterior processes, and with a reduced and posterior sutural joint between the basipterygia; Astroblepidae shows a very distinguished pelvic girdle, with long posterior processes, racquet-like lateropterygium and musculature well developed; and Loricariidae showed a spikelike lateropterygium, synchondral joint of the basipterygia between sutures or not, and well developed condyles for articulation of the pelvic rays. Nematogenyidae and Trichomycteridae share a similar disposition of the anterior processes and the presence of unfused cartilage between the basipterygia. The other Loricarioidea, or advanced Loricarioidea, already show sutural joints between the basipterygia. Astroblepidae and Loricariidae share, among other features, the presence of the lateropterygium, presence of condyles for articulation of the pelvic rays and synchondral joint followed by sutures. Some new features are described for some of the families (Nematogenyidae, Trichomycteridae and Astroblepidae). The present work brought additional support to the current hypothesis of relationship among Loricarioidea families.

ASSUNTO(S)

siluriformes morfologia esquírola pélvica osteologia lateropterígio zoologia basipterígio

ACESSO AO ARTIGO

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