What is the difference between Plesiosaur and Mosasaur?

The difference between plesiosaur and mosasaur

is that “plesiosaur” is any of several extinct marine reptiles, of the order Plesiosauria, from the Jurassic and Cretaceous periods. [from c. 1840] and “mosasaur” is a large extinct marine reptile in the family Mosasauridae, dominant marine predator of the Cretaceous. Mosasaurs are considred to be in squmata, the same group that includes lizards and snakes.[from c. 1840].

plesiosaur

mosasaur

Noun

  • Any of several extinct marine reptiles, of the order Plesiosauria, from the Jurassic and Cretaceous periods. [from c. 1840]

Exemple

  • “Look!” cried Olson. “Would you look at the giraffe comin’ up out o’ the bottom of the say?” We looked in the direction he pointed and saw a long, glossy neck surmounted by a small head rising above the surface of the river. Presently the back of the creature was exposed, brown and glossy as the water dripped from it. It turned its eyes upon us, opened its lizard-like mouth, emitted a shrill hiss and came for us. The thing must have been sixteen or eighteen feet in length and closely resembled pictures I had seen of restored plesiosaurs of the lower Jurassic.
  • Synonym: plesiosaurus

Noun

  • A large extinct marine reptile in the family Mosasauridae, dominant marine predator of the Cretaceous. Mosasaurs are considred to be in squmata, the same group that includes lizards and snakes.[from c. 1840]

Examples

  • What I find deeply disturbing, however, is that Mr. Ross could believe that the earth was created 10,000 years ago, but nevertheless write in his dissertation that mosasaurs, or marine reptiles, existed more than 65 million years ago.
  • Mosasaurs could reach lengths of up to 17m and lived mainly in offshore waters of the Late Cretaceous.