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Re: sauropods & ornithischian relationship
>From: Don Squires <email@example.com>
> The sauropod dinosaurs and their prosauropod kin are classified in the same
> suborder as theropods, i.e., saurischia. Is this classification based only
> on the
> shape of the hip?
No, there are other factors, ranging from general to very detailed.
The ornithischians have a number of specializations, such as
few or no teeth on the premaxilla, which are rare in saurischians
(the main exception being the segnosaurs).
Also, each group has a goodly number of detailed (minor) anatomical
specializations found in most members. Thus the segnosaurs are
recognized as theropods by their sharing with theropods a number
of details of the legs and vertebrae, despite some overall
similarities to onithischians.
> Is it possible that the sauropodamorpha are more closely related to the
> herbivorous dinosaurs classified as ornithischians than to theropods? I seem
> recall reading this somewhere.
This has been suggested, but not widely accepted
The peace of God be with you.