Behemotops

Behemotops (from the Biblical monster Behemoth, by Linnaeus and others believed to be a hippo) is an extinct genus of herbivorous marine mammal. It lived from the Early Oligocene (Rupelian) through the Late Oligocene (33.9 mya—23 Mya), existing for approximately 10.9 million years. It is the most primitive known desmostylian, believed to be close to the ancestry of all other desmostylians.

In 1976, Emlong discovered a juvenile mandible — USNM 244035 — on Olympic Peninsula, Clallam County, Washington (48°12′N 123°54′W / 48.2°N 123.9°W / 48.2; -123.9, paleocoordinates 47°48′N 115°00′W / 47.8°N 115.0°W / 47.8; -115.0) which Domning, Ray & McKenna 1986 made the holotype of B. proteus. Teeth of a young adult — LACM 124106 – was found in the same rock unit in 1986.