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Re: Emus a Model for Dinosaurs?

In all fairness, "quite different" is relative. Neornithes limb mechanics are very similar to dinosaurs in their articular contacts (even accounting for fusion of the metapodia and the tibiotarsus). Limb excursion (as Tim and Jim and Jim noted) is generated somewhat differently (shifting from the primitive acetabulum based locomotion to the more derived knee-based limb excursion), but the maximum and minimum ranges of motion are very similar, including off-axis motion (which is important). And the actual plantar surface of the feet (and the internal bones, tendons, and ligaments that create it) of modern cursorial dinosaurs are almost identical in how they function to their Mesozoic brethren. Certainly much better than using most extant placental feet to understand the biomechanics of Mesozoic mammal trackways.


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: jrccea@bellsouth.net
To: andreasj@gmail.com; dinosaur@usc.edu
Sent: Fri, 27 Oct 2006 8:41 AM
Subject: Re: Emus a Model for Dinosaurs?

They are.

Andreas Johansson wrote:

Aren't neornithine leg mechanics quite different from those of
"classical" theropods?

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