The caudal vertebral series in abelisaurid dinosaurs
0 comentarios Publicado por Leonardo Filippi en 5:18
Ariel H. Méndez
The caudal
vertebrae of abelisaurid theropods show notable variations in the shape of the
transverse process, among other characters, and these distinguish the two
subclases Brachyrostra and Carnotaurini. The vertebrae in the proximal third of
the tail in abelisaurids, especially derived taxa, show adaptations that
provide considerable rigidity, when compared to other theropod dinosaurs,
especially Maniraptora, which have highly flexible tails. This continues the
considerable rigidity in the neck, trunk, and sacral region in abelisaurids,
and is consistent with the hypothesis that South American abelisaurids evolved
in isolation from those that inhabited India and Madagascar.
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