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Dinosauria (was Re: Amy's "Poser")

>(This message is in reply to Amy Tilescia's question about the
> "official" definition of"dinosaur")

[Ed. note - Oh, god, no!  Not another phylogenetic posting from Holtz... ;-) ]

Dinosauria can be formally defined as the most recent common ancestor of
Saurischia and Ornithischia and all of that ancestor's descendants.  This
would include the birds, exclude pterosaurs and 'lagosuchians', and may (or
may not) excluded Herrerasaurus, Staurikosaurus, and Eoraptor.

                 Thomas R. Holtz, Jr.                  Phone: 703-648-5280      
                 Vertebrate Paleontologist         Fax:    703-648-5420
tholtz@geochange.er.usgs.gov ------------>       th81@umail.umd.edu
U.S. Geological Survey          ------------->       University of Maryland
Branch of Paleontology & Stratigraphy ---->       Department of Geology
MS 970 National Center
Reston, VA  22092               ------------->        College Park, MD  20742