Re: Archaeopteryx flight

["David Marjanovic" <david.marjanovic@gmx.at>]

----- Original Message -----
From: "Zoe Heraklides" <z_heraklides@hotmail.com>
Sent: Tuesday, September 04, 2001 11:02 PM

> David Marjanovic writes:
>
> >While I don't know about that, *Coelophysis* was apparently still able to
> >rotate its lower arms, while *Allosaurus* (pers. obs. on the cast in the
> >museum here) and more birdlike theropods can't do that
>
> But what specific features did you "personally observe" that led you to
this
> conclusion  - that tetanurine forearms are less rotatable (i.e.
> supination/pronation) compared to coelophysids?

The ulna of *Allosaurus* has a flange that locks the radius in place.
Neither of these bones is proximally rounded in cross-section. If you look
at it, you see immediately that it couldn't rotate.