Orophosaurus
Orophosaurus is an dubious genus of elasmosaurid plesiosaur from the Late Cretaceous of New Mexico. Taxonomy
Orophosaurus is known only from the type species, O. pauciporus, which is based on AMNH 5692 (portions of three cervical vertebrae). The holotype was found in the Late Cretaceous Fox Hills Formation of the San Juan Basin in New Mexico. Welles (1962) judged Orophosaurus to be a nomen vanum because of the very fragmentary nature of the holotype. See also
 List of plesiosaur genera
 Timeline of plesiosaur research

References

Elasmosaurids
Taxa named by Edward Drinker Cope
Sauropterygian genera