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RE: Gallimimid & Ornithomimid arms -- shrinkable?
> From: firstname.lastname@example.org [mailto:email@example.com]On Behalf Of
> Wondering here...
> What did the "Ostrich mimic" dinosaurs use their arms for? (if I recall
> 'predatory dinosaurs of the world', they may've used their arms for grasping
> branches to facilitate feeding....yes?).
I'd go with that.
> Could those arms shrink to Tyrannosaurid proportions?
Sure, if natural selection (or some other mode of evolution) favored that. As
far as we know it didn't. (Although some workers have
suggested that alvarezsaurids were close relatives of ornithomimosaurs. If you
modified their hypothesis and made alvarezsaurids a
clade within Ornithomimidae, then you would have an example of this...)
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
Building 237, Room 1117
College Park, MD 20742
Phone: 301-405-4084 Email: firstname.lastname@example.org
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796