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RE: eggshells, therizinosaurs & tyrannosaurs
> From: firstname.lastname@example.org [mailto:email@example.com]On Behalf Of
> Ken Kinman
> But so far, it sounds as though the "ornithoid" eggshell
> morphology is
> characteristic of primitive birds (including enantiornithines and living
> ratites) and the "non-avian" maniraptoran theropods (troodonts and
> oviraptors, and presumably dromaeosaurs by inference).
We do have to remember, though, that even within clades (such as Squamata or
Aves) you can get different shell structure morphology.
> Since Therizinosaurs have the primitive dinosauroid eggshells, this
> seems to support Sereno's exclusion of that group from Maniraptora. If
> Sereno is correct in placing tyrannosaurs as the immediate
> outgroup of the
> Maniraptora (sensu stricto),
You mean "sensu Sereno". Maniraptora sensu stricto is "modern birds and all
taxa closer to modern birds than to Ornithomimidae": see Gauthier 1986.
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: firstname.lastname@example.org
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-314-7843