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Re: Platypus a living fossil?
>Surely this is simply a statement of one hypothesis, the other being that
>Mammalia=the common ancestor of all groups traditionally regarded as
>mammals EXCEPT Monotremata, the issue being whether including Monotremata
>would perforce include certain creatures that would otherwise be regarded as
>Therapsids (if, for example, the common ancestor were something like
I have not seen any (paleo- or neontological) systematics work which
excludes monotremes from Mammalia. If you have the ref, I'd be glad to
take a look!
(And, the group of marsupials + placentals is almost always called Theria).
Thomas R. Holtz, Jr. Phone: 703-648-5280
Vertebrate Paleontologist Fax: 703-648-5420
email@example.com ------------> firstname.lastname@example.org
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