Re: Guts-Eating Spinosaurs

["Mickey_Mortimer11" <Mickey_Mortimer11@email.msn.com>]

Fam Jansma wrote-

> Has there been a comparison between the two families except for Paul in
his
> Predatory Dinosaurs of the World in which he argues they are related?

Spinosaurids are near certainly tetanurines, as found by Holtz (2000, 2001),
Rauhut (2000), Sereno et al. (1998), etc..  The main resemblence cited
between coelophysoids sesu lato and spinosaurids was the subnarial gap.
This structure is actually differently formed in coelophysoids sensu stricto
and Dilophosaurus, with the latter having a more similar construction to
spinosaurids.  The other characters Paul mentions are best seen as parallels
with Dilophosaurus (posteriorly positioned external nares) or primitive
(long, primitive presacral centra; shallow rib cage).

Mickey Mortimer