Re: Dinosaurian Hyoid Apparatus

[jonathan.r.wagner@mail.utexas.edu]

To the best of my recollection, splanchnocranial (sic?, "visceral") elements 
have been described for _"Corythosaurus" casuarius_ (in Ostrom, 1961), and 
_Protohadros byrdi_ (Head, 1998, including CbII!!!). They are present, but 
undescribed, on a specimen of _Edmontosaurus regalis_ in the BMNH (illiustrated 
by Norman in his Encyclopaedia of Dinosaurs, I believe), and I suspect they are 
more prevalent than the literature would seem to indicate. We have some 
isolated, robust hyoids from Big Bend that have raised questions, since the 
only other known hadrobits from the same unit include very *reduced* hyoids 
(the new species from my poster at SVP '01). Also, I don't think it'll be 
published anytime soon, but I prepared a probable _Chasmosaurus mariscalensis_ 
dentary from a bonebed that preserved a rather modest CbI within the Meckelian 
fossa (!).

Wagner