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Re: Details on Ricardoestesia isosceles

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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