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Re: Re: Dimetrodon



>Steve Jackson wrote:
>
>> The sail-backed <I>Dimetrodon<$> is one of the best-known prehistoric
>> animals, and is often found in sets of dinosaur models, but it was not a
>> dinosaur.
>> It was a <I>sphenacodont,<$> and was more closely related to mammals than
>> to reptiles. It actually lived in the Permian Age, long before the
>
>Hmm.  Perhaps you should insert the word "modern" in here, as in
>"more closely related to modern mammals than to modern reptiles."
>
>As a "mammal-like reptile," sphenacodonts are still reptiles,
>and so about as closely related to reptiles as you can get. <g>

Not!

Synapsida is now excluded from Reptilia/Sauropsida, and always should have
been.

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

"There are some who call me...  Tim."