Re: Dinosaur Taxonomy (was Re: Re: dinosaur flatware)

[Stan Friesen <swf@ElSegundoCA.ATTGIS.COM>]

From: pharrinj@PLU.edu
ither
 > 
 > But how can you classify the (hypothetical) common ancestor of 
 > Herrerasauria and Theropoda in either group?  If you use a typological 
 > classification, you cannot place it in the Herrerasauria, for instance, 
 > because it necessarily lacks the defining characteristics of that group.

Not if the defining characters of Herrerasauria do not include any
uniquely derived characters found only in the known herrerasaurs.

[Actually, I am not convinced that the known hererasaurs *do* form
a monophyletic group - especially if one includes Eoraptor].

swf@elsegundoca.attgis.com              sarima@netcom.com

The peace of God be with you.