Apatosaurus

Apatosaurus was a species of sauropod dinosaur indigenous to planet Earth millions of years ago during the Jurassic period.

Lieutenant Dale Bannon wondered if the family of titanosaurs he and the rest of the USS Enterprise (NCC-1701)'s landing party came across were Apatosaurs. He quickly rejected this as they were in the late-Cretaceous rather than the Jurassic.