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Re: Question about Archaeopteryx's (non) reversed hallux

Actually, not only do other theropods lack a retroverted hallux, but so do dromaeosaurs, Archaeopteryx, and basal-most birds. Birds with retroverte hallices must modify the development of their first metatarsal, literally twisting it so that the functional toe can point backwards. This leaves a characteristic twist (torsion) that can be fairly easily identified in fossils. Archaeopteryx and all dromaeosaurs lack this (along with all non-avian theropods) and hence none of them have a reversed hallux.

Scott Hartman Science Director Wyoming Dinosaur Center 110 Carter Ranch Rd. Thermopolis, WY 82443 (800) 455-3466 ext. 230 Cell: (307) 921-8333


-----Original Message-----
From: soixmoi@gmail.com
To: DINOSAUR@usc.edu
Sent: Mon, 9 Oct 2006 11:47 PM
Subject: Re: Question about Archaeopteryx's (non) reversed hallux

"Thank you for the feedback!Â
Torsten van der Lubbe"Â
No, thank YOU for helping me understand all this. Your reply wasÂ
almost instantaneous and it cleared everything up for me.Â
I still have one more question though. Is a retroverted hallux a traitÂ
that's shared in all theropoda or only dromaeosaurs?Â

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