Definitions of Segnosauria

["Nick Gardner" <ratites637@hotmail.com>]

Mike Keesey wrote:
> Why not the other way around, since _Therizinosauria_ is already defined as 
> a stem-based clade?

http://www.cmnh.org/dinoarch/2000Apr/msg00141.html
http://www.cmnh.org/dinoarch/2002Jan/msg00583.html
http://www.cmnh.org/dinoarch/2001Sep/msg00670.html

I've seen two or three suggestions for a definition of Segnosauria:

1. The common ancestor of both _Beipiaosaurus_ and _Segnosaurus_ (Suggested 
by T. Mike Keesey)
2. All taxa closer to _Segnosaurus_ or _Therizinosaurus_ than to 
_Oviraptor_, _Troodon_, _Ornithomimus_, _Velociraptor_, _Mononykus_, or 
birds (Suggested by Jaime A. Headden)
3. The common ancestor of _Beipiaosaurus_, _Alxasaurus_, _Nothronychus_, and 
Therizinosauridae (Implied by Jaime A. Headden)





Nick Gardner
 = paleoartist
 = paleogeek

_________________________________________________________________
The new MSN 8: advanced junk mail protection and 2 months FREE*  
http://join.msn.com/?page=features/junkmail