Opisthiamimus gregori is an extinct, small-bodied relative of the tuatara (Sphenodon punctatus), the only living member of the reptilian order Rhynchocephalia. An artistic interpretation of Opisthiamimus gregori. Image credit: Julius Csotonyi / Smithsonian Institution. Opisthiamimus gregori lived in North America during the Late Jurassic epoch, about 150 million years ago. The ancient reptile belongs to Rhynchocephalia, the group that includes the...
