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Re: Ornithopsida (was Re: Dinosauria---Rejected Name?)
In a message dated 2/23/02 9:36:05 PM Eastern Standard Time,
> Is this what you put in your groups?
> Theropsida = Mammals, "Pelycosaurs", Therapsids
> Chelonopsida = Turtles and more basal anapsids
> Herpetopsida = Lepidosaurs
> Suchopsida = Crocodiles and their extinct relatives
> Ornithopsida = Dinosaurs (inc. Birds) and Pterosaurs
Pretty much. They all had definitions like the following:
Ornithopsida = all amniotes more closely related to modern birds than to
modern mammals, modern turtles, modern snakes, or modern crocodiles.
Thus, the content might change depending on your phylogenetic hypothesis. If
turtles are archosaurs, Chelonopsida would be a subgroup of archosauria, and
pareiasaurs, etc., would be outside any of the groups named above.
Similarly, if pterosaurs are derived prolacertiforms, they would not fall
into any of the five groups.