Kingdom Animalia Superorder Lepidosauria Rank Genus | Class Reptilia Phylum Chordata Order Rhynchocephalia | |
Similar Rhynchocephalia, Priosphenodon, Kallimodon, Diphydontosaurus, Clevosaurus | ||
Opisthias is a Late Jurassic genus of sphenodont reptile from the Morrison Formation of western North America, present in stratigraphic zones 2 and 4-6.
Distribution
Opisthias was from the United States (Colorado, Utah, and Wyoming).
References
Opisthias Wikipedia(Text) CC BY-SA