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Re: dinos and birds
Dora Smith wrote-
> Actually birds belong to a large family of warm-blooded reptiles, and a
> subgroup of those that had feathers. Not merely descendants of.
Well, they are both the descendants of earlier reptiles, and reptiles
> I do wonder whether it is time to subdivide them. Reptiles differ almost
> as much from each other as oxygen-breathing organisms from other primitive
Done and done.
Assuming turtles are relatives of pareiasaurs, reptiles are subdivided into
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
Lepidosauromorpha - containing lizards, snakes, sphenodonts, plesiosaurs,
placodonts, ichthyosaurs, and perhaps turtles.
Archosauromorpha - containing pterosaurs, crocodilians, birds and other
dinosaurs, and perhaps turtles.
Undergraduate, Earth and Space Sciences
University of Washington
The Theropod Database - http://students.washington.edu/eoraptor/Home.html