Thalattosaurus was a shellfish-eating reptile around 2 meters (7 ft) in length occurring in the Lower and Middle of British Columbia as well as Upper Triassic of California.[2] Although originally described as four distinct species by Merriam in 1905, one was proven to be T. alexandrae upon further inspection and another has a missing type specimen. Currently it is believed to include two known species; Thalattosauridae alexandrae and Thalattosauridae borealis. Both species have paddle-like limbs and a down-turned rostrum.
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