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Aucasaurus (abelisaurid theropod) endocranial morphology



From: Ben Creisler
bcreisler@gmail.com

A new online paper:

Ariana Paulina-Carabajal and Cecilia Succar (2014)
The endocranial morphology and inner ear of the abelisaurid theropod
Aucasaurus garridoi.
Acta Palaeontologica Polonica (in press)
doi: http://dx.doi.org/10.4202/app.2013.0037
http://app.pan.pl/article/item/app20130037.html

A partial cranial endocast and right inner ear of the Cretaceous
abelisaurid dinosaur Aucasaurus garridoi were digitally reconstructed
from CT scans. The forebrain, midbrain, and hindbrain resemble the
morphology described for the abelisaurids Majungasaurus and
Indosaurus. However, Aucasaurus exhibits a floccular process that is
relatively larger than that of Majungasaurus. In Aucasaurus the
flocculus is enclosed in an 8-shaped floccular recess, similar in
shape and size to that observed in Abelisaurus, suggesting that the
two Patagonian taxa were capable of a slightly wider range of
movements of the head. Here we describe the second inner ear known for
the Abelisauridae. The labyrinth of the inner ear is similar in shape
and size to the semicircular canals of Majungasaurus, although the
lateral semicircular canal is shorter in Aucasaurus.

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