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Pampadromaeus (Triassic sauropodomorph) femoral anatomy

Ben Creisler

A new online paper:

Rodrigo Temp Müller, Max Cardoso Langer, Sérgio Furtado Cabreira &
Sérgio Dias-da-Silva (2015)
The femoral anatomy of Pampadromaeus barberenai based on a new
specimen from the Upper Triassic of Brazil.
Historical Biology (advance online publication)

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.