Saurischia
Sign in to saveSaurischia ( , meaning "reptile-hipped" from the Greek '''' () meaning 'lizard' and '''' () meaning 'hip joint') is one of the two basic divisions of dinosaurs (the other being Ornithischia), classified by their hip structure. Saurischia and Ornithischia were originally called orders by Harry Seeley in 1888, though today most paleontologists classify Saurischia as an unranked clade rather than an order.
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Saurischia is one of the two main groups of dinosaurs, distinguished by their "reptile-hipped" hip structure, and includes both the long-necked sauropods and the two-legged theropods. Scientists originally classified it as an order in 1888, but today most paleontologists recognize it as a fundamental evolutionary branch of dinosaurs rather than using that older ranking system.
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Saurischia ( , meaning "reptile-hipped" from the Greek '''' () meaning 'lizard' and '''' () meaning 'hip joint') is one of the two basic divisions of dinosaurs (the other being Ornithischia), classified by their hip structure. Saurischia and Ornithischia were originally called orders by Harry Seeley in 1888, though today most paleontologists classify Saurischia as an unranked clade rather than an order.
==Description== All carnivorous dinosaurs (certain types of theropods) are traditionally classified as saurischians, as are all of the birds and one of the two primary lineages of herbivorous dinosaurs, the sauropodomorphs. At the end of the Cretaceous Period, all saurischians except birds became extinct in the course of the Cretaceous–Paleogene extinction event. Birds, as a group of maniraptoran theropod dinosaurs, are a sub-clade of saurischian dinosaurs in phylogenetic classification.