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_Lagosuchus_ was close to, but not quite, a dinosaur.  I often see the 
character "perforated acetabulum" as defining dinosaur, but _Lagosuchus_ 
had that trait (and, yes--I know there are even other non-dinosaurian 
reptiles having perforated acetabula).  Then, I've seen three sacral 
vertebrae specified for dinosaur, but apparently _Herrerasaurus_ and 
_Eoraptor_ still had only two "fully incorporated" (as labeled by Sereno 
and Novas) sacral vertebrae.  

So, I'm not sure what to say it REALLY is that shows _Lagosuchus_ is not 
a dinosaur.  Can anyone help me with this one?  Thanks in advance.

Norman R. King                                       tel:  (812) 464-1794
Department of Geosciences                            fax:  (812) 464-1960
University of Southern Indiana
8600 University Blvd.
Evansville, IN 47712                      e-mail:  nking.ucs@smtp.usi.edu