Opisthias

Opisthias is a Late Jurassic genus of sphenodont reptile from the Morrison Formation of western North America,[2] present in stratigraphic zones 2 and 4–6.[3], An indeterminate species is also known from the Lulworth Formation of the UK.

Opisthias Temporal range: Late Jurassic PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Lepidosauria
Order:	Sphenodontia
(unranked):	†Opisthodontia
Genus:	†Opisthias
Species
O. rarus † (type) Gilmore, 1905[1]

Distribution

Opisthias was from the United States (Colorado, Utah, and Wyoming).[1], as well as in southern England.

See also

• Prehistoric reptile
• Paleobiota of the Morrison Formation

References

1. "Archived copy". Archived from the original on 2010-03-06. Retrieved 2010-03-03.CS1 maint: archived copy as title (link)
2. Foster, J. (2007). "Table 2.1: Fossil Vertebrates of the Morrison Formation." Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 58-59.
3. Foster, J. (2007). "Appendix." Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 327-329.