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

2015; Taylor & Francis; Volume: 28; Issue: 5 Linguagem: Inglês

10.1080/08912963.2015.1004329

1029-2381

Rodrigo Temp Müller, Max C. Langer, Sérgio Furtado Cabreira, Sérgio Dias‐da‐Silva,

Ichthyology and Marine Biology

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 Paraná 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.