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Protoceratops "hyoid" bones misidentified
From: Ben Creisler
A recent paper apparently not yet mentioned on the DML:
Eric M. Morschhauser & Matthew C. Lamanna (2013)
A Reevaluation of the Hyoid Bones of Protoceratops andrewsi Granger
and Gregory, 1923 (Ornithischia: Ceratopsia) and a Review of Hyoid
Elements in Ornithischian Dinosaurs.
Annals of Carnegie Museum 81(4):247-255.
We present a reinterpretation of the bones previously identified as
ossified hyoid elements in the Asian Late Cretaceous ceratopsian
dinosaur Protoceratops andrewsi Granger and Gregory, 1923. Comparisons
with other ceratopsian skeletons indicate that the tetraradiate bone
tentatively regarded as a first ceratobranchial is actually an
incomplete middle cervical rib, and the larger, flattened elements
identified as second ceratobranchials are partial sternal plates. As
in nearly all other ornithischian dinosaurs for which this area of the
skeleton is known, the ossified hyoid apparatus of P. andrewsi
probably consisted of a pair of rod-like first ceratobranchials; two
additional, splint-like or sheet-like bones that are most frequently
interpreted as ceratohyals may also have been present.