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Pampadromaeus (Triassic sauropodomorph) femoral anatomy



Ben Creisler
bcreisler@gmail.com

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)
DOI:10.1080/08912963.2015.1004329
http://www.tandfonline.com/doi/full/10.1080/08912963.2015.1004329#abstract


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.