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Re: Dinosaurian Class

On Fri, 19 Jun 1998, Jaime A. Headden wrote:

> I do not know the difference between Reptilia (new definition) and
> Diapsida. 

Reptilia = (+Chelonia, +_Sphenodon_, +Squamata, +Crocodylia)
(which of course makes it include Aves as well)

I'm not sure what the exact cladistic definition of Diapsida is, but it
falls somewhere between Sauria (+Lepidosauria, +Archosauria) and the more
inclusive Romeriida (+Sauria, -Chelonia). Romeriida is the sister group to
Anapsida (+Chelonia, -Sauria).

See http://umbc.edu/~tkeese1/dinosaur/animalia.htm
(mostly taken from thew on-line Tree of Life)

--T. Mike Keesey                                   <tkeese1@gl.umbc.edu>
DINOSAUR WEB PAGES -- http://www.gl.umbc.edu/~tkeese1/dinosaur/index.htm