Genus: Orophosaurus COPE, 1887 (nomen dubium)
Etymology: Greek, orophe, “roof, ridgepole” and Greek, sauros, “lizard”: Roof lizard.

Species: pauciprous COPE, 1887
Etymology:

Holotype: AMNH 5692

Locality: Unknown, San Juan Basin, New Mexico.

Horizon: "Fox Hills Cretaceous", Lewis shale and/or Pictured Cliffs Sandstone.

Biostratigraphy:

Age: Upper Campanian Stage, Upper Seninian Subepoch, Upper Gulf Epoch, Late Cretaceous.

Material: Parts of 3 cervical vertebrae of a small elasmosaurid?