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RE: Troodon eggs

Jeffrey posted that reply from Carpenter saying Troodon is known from Continuoolithus (ornithoid) eggs. And now we have this paper saying Troodon is known from non-ornithoid eggs.
Something doesn't sound right here, or the ornithoid/non-ornithoid eggshell distinction isn't as phylogenetically informative as some think it is. Guess I'd better put the Varricchio paper on the top of my read list.
Scratching my head, Ken

From: "Thomas R. Holtz, Jr." <tholtz@geol.umd.edu>
Reply-To: tholtz@geol.umd.edu
To: <kinman@hotmail.com>, <dinosaur@usc.edu>
Subject: RE: Troodon eggs
Date: Tue, 29 Aug 2000 17:35:02 -0400

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Ken Kinman
> I have not yet read the paper cited below, but wonder if
> anyone knows
> if their conclusions have been challenged. Particularly the conclusion that the "non-ornithoid" eggs they found are troodontids.

Would be difficult to discount, as these eggs contain embryonic remains of

> They
> apparently also
> reject the Troodon identification of ornithoid eggs found earlier in
> Montana.

Yes. Basically, the eggs long identified as from _Orodromeus_ in fact belong
to _Troodon_ (see Horner & Weishampel 1996. Nature 383: 103). From the
Varricchio et al. paper:
"Additionally, the tentative assignment of Two Medicine ornithoid-ratite
egs with a dispersituberculate surface to ?_Troodon_ (...) is incorrect.
These eggs remain unassignable to a specific dinosaur taxon."

Off the top of my head, I would speculate those eggs might be
_Chirostenotes_ or _Ricardoestesia_, among named dinosaurs.

              Thomas R. Holtz, Jr.
              Vertebrate Paleontologist
Department of Geology          Director, Earth, Life & Time Program
University of Maryland         College Park Scholars
              College Park, MD  20742
Phone: 301-405-4084    Email:  tholtz@geol.umd.edu
Fax (Geol):  301-314-9661      Fax (CPS-ELT): 301-405-0796

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