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RE: synapsids (was RE: pdf request)
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of firstname.lastname@example.org
> If you visit David Peters' website, he has his own
> mega-cladogram that apparently includes more reptile taxa
> than any other. I believe he includes the synapsida as the
> sister of Archosauromorpha. Could synapsids and diapsids be
> sister taxa, a clade excluding parareptiles, or even other
> reptiles? I don't know a lot about Paleozoic diapsids, but I
> hope someone else does.
I will leave it for others to comment on detail, if they wish (David? Mickey?).
But in brief, Peter's analyses have a lot to be
desired in terms of anatomical interpretation, methodological approaches, etc.
The wealth of data (genetic, genomic, morphological, developmental, etc.)
pretty securely place turtles and traditional diapsids
together in at least some combination, and the skeletal data for parareptiles
being closer to diapsids than to synapsids is very
The idea of a synapsid-archosaur or synapsid-diapsid clade clade has a long
history (Diaptosauria; early non-computerized cladistic
analyses, etc.) And you can certainly pick out a few characters to support it
(thecodonty, for one). But it doesn't pop out in the
really comprehensive studies of Permo-Triassic critters.
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA