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News: THE SEARCH FOR ATLANTIS IN CUBA
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Dinosaurs: Their Rise & Fall

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Author Topic: Dinosaurs: Their Rise & Fall  (Read 9972 times)
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Melody Stacker
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« Reply #15 on: June 04, 2009, 01:22:17 pm »

A. Eoraptor, an early saurischian, B Lesothosaurus, a primitive ornithischian, C Staurikosaurus (Saurischia) pelvis, D Lesothosaurus pelvis

It is clear from this figure that early saurischian resembled early ornithischia, but not modern crocodiles. Saurischians ('lizard-hipped') are distinguished from the ornithischians ('bird-hipped') by retaining the ancestral configuration of bones in the pelvis. Another difference is in the skull, the upper skull of the Ornithischia is more solid and the joint connecting the lower jaw is more flexible; both are adaptations to herbivory and both can already be seen in Lesothosaurus.
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