Saurischia

Saurischians; Temporal range: ; Late Triassic – Present, 233.23–0 Ma PreꞒ Ꞓ O S D C P T J K Pg N Possible Middle Triassic record
	Montage of six different representatives of saurischian dinosaurs.; 1st row (early saurischians):; Herrerasaurus ischigualastensis (herrerasaur),; Eodromaeus murphi (basal theropod);; 2nd row (theropods):; Pelecanus occidentalis,; Tyrannosaurus rex;; 3rd row (sauropodomorphs):; Apatosaurus louisae,; Plateosaurus trossingensis.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Dinosauria
Clade:	Saurischia; Seeley, 1888
Subgroups
Saurischians of; uncertain affinity
	†Alwalkeria; †Chindesaurus; †Daemonosaurus; †Eodromaeus; †Saltopus?; †Tawa;

Saurischia (/sɔːˈrɪskiə/ saw-RIS-kee-ə, meaning "reptile-hipped" from the Greek sauros (σαῦρος) meaning 'lizard' and ischion (ἴσχιον) meaning 'hip joint')^[3] 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^[4] though today most paleontologists classify Saurischia as an unranked clade rather than an order.^[5]

^ Langer, M.C.; Ramezani, J.; Da Rosa, Á.A.S. (2018). "U-Pb age constraints on dinosaur rise from south Brazil". Gondwana Research. X (18): 133–140. Bibcode:2018GondR..57..133L. doi:10.1016/j.gr.2018.01.005.
^ Nesbitt, S. J.; Barrett, P. M.; Werning, S.; Sidor, C. A.; Charig, A. J. (2013). "The oldest dinosaur? A Middle Triassic dinosauriform from Tanzania". Biol. Lett. 9 (1): 20120949. doi:10.1098/rsbl.2012.0949. PMC 3565515. PMID 23221875.
^ Oxford English Dictionary
^ "I. On the classification of the fossil animals commonly named Dinosauria". Proceedings of the Royal Society of London. 43 (258–265): 165–171. 31 December 1888. doi:10.1098/rspl.1887.0117. S2CID 129792059.
^ Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). (2004). The Dinosauria. 2nd edition. University of California Press, Berkeley. 833 pp.

[langer18-1] Langer, M.C.; Ramezani, J.; Da Rosa, Á.A.S. (2018). "U-Pb age constraints on dinosaur rise from south Brazil". Gondwana Research. X (18): 133–140. Bibcode:2018GondR..57..133L. doi:10.1016/j.gr.2018.01.005.

[Nyasasaurus-2] Nesbitt, S. J.; Barrett, P. M.; Werning, S.; Sidor, C. A.; Charig, A. J. (2013). "The oldest dinosaur? A Middle Triassic dinosauriform from Tanzania". Biol. Lett. 9 (1): 20120949. doi:10.1098/rsbl.2012.0949. PMC 3565515. PMID 23221875.

[3] Oxford English Dictionary

[seeley1888-4] "I. On the classification of the fossil animals commonly named Dinosauria". Proceedings of the Royal Society of London. 43 (258–265): 165–171. 31 December 1888. doi:10.1098/rspl.1887.0117. S2CID 129792059.

[dinosauria2-5] Weishampel, D.B., Dodson, P., and Osmólska, H. (eds.). (2004). The Dinosauria. 2nd edition. University of California Press, Berkeley. 833 pp.

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