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Re: dinos and birds
Oh, alright. I'm not sure about the scheme of division, though.
I researched those warm fuzzy pterosaurs. They did have hair, since they
also had lightweight bodies and strong wings it is logical to think they
flew, and that adds up to they must have been warm blooded. They are now
classified together with dinosaurs as a separate group with a theoretical
common ancestor more closely related to them than to other reptiles.
----- Original Message -----
From: "Mickey Mortimer" <Mickey_Mortimer111@msn.com>
Sent: Sunday, July 04, 2004 6:51 PM
Subject: Re: dinos and birds
> > I do wonder whether it is time to subdivide them. Reptiles differ
> > as much from each other as oxygen-breathing organisms from other
> > life.
> Done and done.
> Assuming turtles are relatives of pareiasaurs, reptiles are subdivided
> two groups-
> Parareptilia / Anapsida / Progonosauria - containing turtles, pareiasaurs,
> procolophonids, and mesosaurs(?).
> Eureptilia / Romeriida - containing lizards, snakes, sphenodonts,
> plesiosaurs, placodonts, ichthyosaurs, pterosaurs, crocodilians, and birds
> and other dinosaurs.
> Assuming turtles are diapsids instead, reptiles are divided into two
> different groups-
> Lepidosauromorpha - containing lizards, snakes, sphenodonts, plesiosaurs,
> placodonts, ichthyosaurs, and perhaps turtles.
> Archosauromorpha - containing pterosaurs, crocodilians, birds and other
> dinosaurs, and perhaps turtles.
> Mickey Mortimer
> Undergraduate, Earth and Space Sciences
> University of Washington
> The Theropod Database - http://students.washington.edu/eoraptor/Home.html