Morphology and phylogenetic significance of the pelvic articular region in elasmobranchs (Chondrichthyes)

Autor(es)

da Silva, Joao Paulo C. B. ; Vaz, Diego F. B.

• Tipo de documento: Artigo Científico
• Fonte: CLADISTICS; v. N/A, p. 43-pg., 2023-03-01.

Resumo

The morphology of paired fins is commonly overlooked in morphological studies, particularly the pelvic girdle and fins. Consequently, previous phylogenetic studies incorporating morphological data used few skeletal characters from this complex. In this paper, the phylogenetic significance of pelvic articular characters for elasmobranchs is discussed in light of the morphological variation observed in 130 species, the most comprehensive study exploring the morphology of the pelvic girdle done so far. The 10 morphological characters proposed herein for the pelvic articulation were incorporated into a molecular matrix of NADH2 sequences and submitted to an analysis of maximum parsimony employing extended implied weighting. The most stable tree was selected based on the distortion coefficients, SPR distances (subtree pruning and regrafting) and fit values. Some of the striking synapomorphies recovered within elasmobranchs include the presence of an articular surface for the first enlarged pelvic radial supporting Elasmobranchii and the pelvic articular region for the basipterygium extending from the posterolatral margin of the pelvic girdle over its lateral surface in Echinorhinus + Hexanchiformes. Additionally, the proposed characters and their distributions are discussed considering the relationships recovered and also compared with previous morphological and molecular phylogenetic hypotheses. (AU)

• Processo FAPESP: 12/22692-9 - Análise do padrão esquelético das nadadeiras pares e suas cinturas em espécies de Chondrichthyes restritas a coleções internacionais
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 10/52677-6 - Filogenia dos principais grupos de chondrichthyes baseada na anatomia comparada do esqueleto das nadadeiras e suas cinturas.
• Beneficiário: João Paulo Capretz Batista da Silva
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/07712-3 - Revisão morfológica e taxonômica do gênero Centroscymnus Barboza du Bocage & Capello 1864 (Chondrichthyes:Squaliformes:Somniosidae)
• Beneficiário: Diego Francisco Biston Vaz
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 13/13137-4 - Revisão morfológica e taxonômica do gênero Centroscymnus Barboza du Bocage & Capello 1864 (Chondrichthyes: Squaliformes: Somniosidae)
• Beneficiário: Diego Francisco Biston Vaz
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Mestrado