| Opisthias Temporal range: Possible Berriasian record
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|---|---|
| |
| Jaw of Opisthias rarus | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Rhynchocephalia |
| Clade: | †Opisthodontia |
| Genus: | †Opisthias Gilmore 1909 |
| Type species | |
| Opisthias rarus Gilmore, 1905[1]
| |
Opisthias is a genus of sphenodont reptile. The type species, Opisthias rarus, is known from the Late Jurassic (Kimmeridgian-Tithonian) of western North America.[2][3]
- ^ "Opisthias Gilmore 1909 (rhynchocephalian)". Paleobiology Database.
- ^ 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.
- ^ Herrera-Flores, J.A.; Stubbs, T.L.; Sour-Tovar, F. (2022). "Redescription of the type specimens for the Late Jurassic rhynchocephalian Opisthias rarus and a new specimen of Theretairus antiquus from Quarry 9, Morrison Formation, Wyoming, USA". Acta Palaeontologica Polonica. 67 (3): 623–630. doi:10.4202/app.00929.2021.