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Re: Details on Ricardoestesia isosceles

If Ricardoestesia were on the order of 2 meters in length, I wouldn't think they would be all that gracile (that only jaws would survive).
Have such indented teeth (waisted?) been found in other non-avian theropods?

From: "Tim Williams" <twilliams_alpha@hotmail.com>
Reply-To: twilliams_alpha@hotmail.com
To: Mickey_Mortimer11@email.msn.com, dinosaur@usc.edu
Subject: Re: Details on Ricardoestesia isosceles
Date: Mon, 26 Feb 2001 12:10:22 -0600

Mickey_Mortimer wrote:

Ricardoestesia Currie, Rigby and Sloan 1990
R. isosceles Sankey 2001

The phylogenetic relationships of Ricardoestesia are obscure due to >the
many plesiomorphies, although it can be safely omitted from >several groups
(Ornithomimosauria, Segnosauria+Oviraptorosauria, >Alvarezsauridae,
Troodontidae, Eumaniraptora). Perhaps it is related to basal coelurosaurs,
tyrannosaurs or Bagaraatan.

I've often wondered if _Ricardoestesia_ might actually be a bird. Says
Julia Sankey of one tooth (V-6237) "The tooth is indented at the base as in
bird teeth (Currie, personal commun., 1999)." If _Ricardoestesia_ is avian,
it may explain why only teeth and a dentary are known for the genus: the
rest of the skeleton was so gracile that it was rarely preserved.



Timothy J. Williams

USDA/ARS Researcher
Agronomy Hall
Iowa State University
Ames IA 50014

Phone: 515 294 9233
Fax:   515 294 3163

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