Due to our ever popular topic of the Marsh/Cope feud, Tylosaurus was known by far too many names when it was originally discovered. Cope proposed the name Macrosaurus only to change his description of the material's placement within the English mosasaur genus Liodon. Then Marsh proposed the name Rhinosaurus from another specimen. Cope decided he liked Rhamposaurus because Rhinosaurus was an occupied name, as Marsh discovered. Rhamposaurus, too, was taken, and Marsh, therefore, changed the name once again to Tylosaurus. Thankfully, that has stayed the name of the genus for about 141 years now. Hopefully it will remain the name for at least another 141 years!
|Smithsonian Tylosaurus, which was found with plesiosaur stomach contents (not pictured), and a Hesperornis following it.|