The femoral anatomy of Pampadromaeus barberenai based on a new specimen from the Upper Triassic of Brazil

Autor(es)

Mueller, Rodrigo Temp ^[1] ; Langer, Max Cardoso ^[2] ; Cabreira, Sergio Furtado ^[3] ; Dias-da-Silva, Sergio ^[4]

Afiliação do(s) autor(es)

^[1] Univ Fed Santa Maria, Programa Pos Grad Biodiversidade Anim, BR-97119900 Santa Maria, RS - Brazil

^[2] Univ Sao Paulo, Lab Paleontol Ribeirao Preto, BR-14049 Ribeirao Preto, SP - Brazil

^[3] Univ Luterana Brasil, Museu Ciencias Nat, Canoas, RS - Brazil

^[4] Univ Fed Santa Maria, Ctr Apoio & Pesquisa Paleontol, BR-97119900 Santa Maria, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: HISTORICAL BIOLOGY; v. 28, n. 5, p. 656-665, JUL 3 2016.
• Citações Web of Science: 8

Resumo

Femora of the holotype and only previously known specimen of the early sauropodomorph Pampadromaeus barberenai are incomplete and fractured. Here, we describe a new complete femur assigned to Pampadromaeus barberenai, quarried from the same outcrop of original type specimen: Janner' site, (Carnian of the Parana Basin). It shares with the holotype of Pampadromaeus barberenai a unique combination of features: anteromedial tuber slightly posteromedially displaced; lesser trochanter proximodistally oriented with the proximal tip gently connected to the femoral shaft; fourth trochanter located on the medial margin along the mediolateral axis of the femur and with an assymetrical outline. In addition, we propose a femoral autapomorphy for Pampadromaeus barberenai: lateral condyle of the distal end of the femur extremely reduced lateromedially. Two distinct phylogenetic analyses place the new specimen as the sister-group of the Pampadromaeus barberenai type-specimen and, in one of them, they are nested within Sauropodomorpha, corroborating the original description and taxonomic assignation. (AU)

• Processo FAPESP: 14/03825-3 - A origem e irradiação dos dinossauros no Gondwana (Neotriássico - Eojurássico)
• Beneficiário: Max Cardoso Langer
• Modalidade de apoio: Auxílio à Pesquisa - Temático