Opisthias is a genus of sphenodont reptile. The type species, Opisthias rarus, is known from the Late Jurassic (Kimmeridgian-Tithonian) Morrison Formation of western North America,[2][3] present in stratigraphic zones 2 and 4–6.[4]
Opisthias
The Great Giants of America
for The Great Giants of America in Dinosaurs Unleashed
Suggested by alecgroskreutz1
Dinosaurs Unleashed is the a documentary tv show that could have 15 stories
