Genus: Edgarosaurus DRUCKENMILLER, 2002
Etymology: In reference to the community of Edga, Montana and Greek, sauros, "lizard."
= Pliosauridae genus: Nova DAMONE, 1994
= Nova DRUCKENMILLER, 1999

Species: muddi DRUCKENMILLER, 2002
Etymology: In honor of Kevin Mudd of Bridger, Montana.

Holotype: MOR 751

Locality: 5 miles southeast of Edgar, T5S, R24E, sec. 28, 108°46’W, 45°24’N, Carbon County, South-central Montana.

Horizon: Upper Thermopolis Shale.

Biostratigraphy: Just below the Neogastroplites haasi zone.

Age: Upper Albian Stage, Middle Gallic Subepoch, Upper Early Cretaceous Epoch, Early Cretaceous.

Material: Skull, mandible, 26 cervical, 3 pectoral, and 5 anterior dorsal vertebrae and a nearly complete forelimb.