[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Turtles and Diverity
To what Ronald said, I would add this. If turtles turn out to be
Archosauromorphs, it would be a superb example of how a powerful tool (like
cladistic analysis) can be a double-edged sword, and must be handled with
care (but has enormous potential).
I am a great believer in the overwhelming benefits of cladistic
analysis (and it will improve as we refine computer algorithms, etc.).
Detractors like Feduccia and Martin tend to exaggerate the occasional
failures of cladistic analysis and ignore the many successes.
If turtles are archosauromorphs and anapsids are therefore extinct,
that's the way it is (and I would enjoy both the novelty and instructiveness
of it). But I will continue to classify them as Order Testudiniformes no
matter where they end up, not as an insignicant twig or "offshoot". It is a
stable taxonomic module, that I would simply removed from the anapsid clade
and plug into the appropriate place in the diapsid clade. Simple as that.
From: Ronald Orenstein <email@example.com>
To: ELurio@aol.com, firstname.lastname@example.org, email@example.com
Subject: Re: Turtles and Diverity was Re: Classification of Plesiosaurs
Date: Fri, 18 May 2001 11:55:49 -0400
At 08:47 AM 18/05/01 -0400, ELurio@aol.com wrote:
WHY?!?!?!?!?! Shouldn't a greater diversity of life living today be far
cooler than greater extinction of forms? Assuming that turtles are
isn't that better for the study of life than having them being just a
insignificant offshoot of the Archosauromorpha like many here are trying
That's "assuming". Some recent studies (which are far from universally
accepted) suggest that the anapsid condition in turtles is secondarily
derived and their closest relatives may be within Diapsida - I suggest that
is what is being referred to here, not a suggestion that all anapsids (eg
pareiasaurs) be moved into Archosauromorpha.
Ronald I. Orenstein Phone: (905) 820-7886
International Wildlife Coalition Fax/Modem: (905) 569-0116
1825 Shady Creek Court
Mississauga, Ontario, Canada L5L 3W2 mailto:firstname.lastname@example.org
Get your FREE download of MSN Explorer at http://explorer.msn.com