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Unformatted text preview: hip morphology The Saurischia (reptile-hipped) and the Ornithischia (bird-hipped). In both groups the ilium and the ischium have relatively similar forms, but in the Ornithiscia, the pubis has a narrow rod-shaped extension running ventrally and posteriorly along the ventral side of the ischium. In the Saurischia, the pubis extends ventrally and anteriorly and only articulates with the ischium (and ilium) to form the hip "socket". Most of the Ornithischia also have a horn covered beak and bony rods and vertebral spines....
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- Fall '10