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Re: Re: Synapsids are NOT reptiles!



>
>
>I always thought that _Thrinaxodon_ was the first true 'modern' mammal. 
>Possibly I'm getting proto-mammal and mammal confused? What is the
>distinction between proto-mammal and 'modern' mammals? 
>
Thrinaxodon has never been considered a mammal (except by Van Valen, who
used "Mammalia" as most systemicists now use Synapsida).

It is, however, pretty close to the origin of mammals.

Thomas R. Holtz, Jr.
Vertebrate Paleontologist
Dept. of Geology
University of Maryland
College Park, MD  20742
Email:Thomas_R_HOLTZ@umail.umd.edu (th81)
Fax: 301-314-9661
Phone:301-405-4084