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Temporal range: Upper TriassicUpper Cretaceous (non-avian)
Replica skeleton of an Eoraptor
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Seeley, 1887
Saurischian pelvis (left side)

Saurischia is one of the two orders of dinosaurs. In 1888, Harry Seeley classified dinosaurs into two main orders.[1] Their hip structure was why they were put into these orders. Saurischians ('lizard-hipped') and the ornithischians ('bird-hipped') have differences in the ways bones in the hip are put together.

All carnivorous dinosaurs (the theropods) are saurischians, and so are the sauropods like Diplodocus and Brachiosaurus.

Birds are direct descendants of a group of theropod dinosaurs,[2] so they are a sub-clade of saurischian dinosaurs in modern classification.

Related pages


  1. Seeley, H.G. (1888). "On the classification of the fossil animals commonly named Dinosauria." Proceedings of the Royal Society of London, 43: 165-171.
  2. Padian K. (2004). "Basal Avialae". In Weishampel, David B. Dodson, Peter & Osmólska, Halszka (eds). The Dinosauria 2nd ed. Berkeley: University of California Press. pp. 210–231. ISBN 0-520-24209-2 .