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Carnotaurus hands



From: Ben Creisler
bh480@scn.org

Now that I'm out of the doghouse (I hope) for accidentally jumping the gun
on Talos because of an embargo-busting news story, here's a new paper.

JAVIER RUIZ, ANGÉLICA TORICES, HUMBERTO SERRANO, &  VALLE LÓPEZ (2011)
The hand structure of Carnotaurus sastrei (Theropoda, Abelisauridae):
implications for hand diversity and evolution in abelisaurids.
Palaeontology (advance online publication)
DOI: 10.1111/j.1475-4983.2011.01091.x
http://onlinelibrary.wiley.com/doi/10.1111/j.1475-4983.2011.01091.x/abstract


Carnotaurus sastrei is an abelisaurid dinosaur from the Late Cretaceous of
Argentina that has very reduced, but robust, forelimbs and derived hands
with four digits, including a large, conical-shaped metacarpal IV lacking
an articulation for a phalanx. The analysis presented in this work
highlights a series of additional autapomorphies of C. sastrei. For
example, the proximal phalanges are longer than the metacarpals in digits
II and III, and digit III includes only one phalanx besides the ungual. The
hand of Carnotaurus shares several features with those of Aucasaurus and
Majungasaurus, but the hands of the latter genera also display
autapomorphies, indicating that the diversity in abelisaurid hand structure
is similar to the diversity of cranial protuberances of these dinosaurs.



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