Dilophosauridae

Eukaryota

Dilophosaurids Temporal range: Late Triassic-Middle Jurassic
Replica Dilophosaurus wetherilli skull and neck, Royal Tyrrell Museum
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Dinosauria
Order:	Saurischia
Suborder:	Theropoda
Node:	Neotheropoda
Family:	†Dilophosauridae Madsen and Welles, 2000
Genera
†Cryolophosaurus †Dilophosaurus †Dracovenator

Dilophosauridae is a family of early carnivorous dinosaurs. They are well-known for their distinctive head crests, which were probably used for mating displays, or to intimidate rivals. The family was proposed by Alan Charig and Andrew Milner in 1990 to contain only the type genus, Dilophosaurus.^[1] Other genera, such as Zupaysaurus and Dracovenator, have since been assigned to this family, though the group has never been given a phylogenetic definition and is not currently a clade. Some studies have suggested that there was a natural group of medium-sized crested theropods which included Dilophosaurus as well as Dracovenator, Cryolophosaurus, and "Dilophosaurus" sinensis, though it has not been formally named Dilophosauridae.^[2] While traditionally assigned to the superfamily Coelophysoidea, these analyses suggest that dilophosaurids may have been more closely related to the group Tetanurae, comprising the more advanced megalosaurs, carnosaurs and coelurosaurs.

Phylogeny

The following cladogram outlines the relationships of Dilophosaurus and its close relatives as recovered by the 2007 analysis of Smith, Makovicky, Pol, Hammer, and Currie.^[2]

Theropoda	Coelophysoidea unnamed Zupaysaurus unnamed unnamed "Dilophosaurus" sinensis unnamed Dracovenator unnamed Dilophosaurus Cryolophosaurus unnamed Neoceratosauria Tetanurae

References

1. ^ Charig, A.J. and Milner, A.C. (1990). "The systematic position of Baryonyx walkeri, in the light of Gauthier's reclassification of the Theropoda." In Carpenter, K. and Currie, P.J. (eds.), Dinosaur Systematics: Perspectives and Approaches, Cambridge University Press: 127-140.
2. ^ ^{a b} Smith, N.D., Makovicky, P.J., Pol, D., Hammer, W.R., and Currie, P.J. (2007). "The dinosaurs of the Early Jurassic Hanson Formation of the Central Transantarctic Mountains: Phylogenetic review and synthesis." In Cooper, A.K. and Raymond, C.R. et al. (eds.), Antarctica: A Keystone in a Changing World––Online Proceedings of the 10th ISAES, USGS Open-File Report 2007-1047, Short Research Paper 003, 5 p.; doi:10.3133/of2007-1047.srp003.

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