Full reference: E. D. Mitchell. 1968. The Mio-Pliocene pinniped Imagotaria. Journal of the Fisheries Research Board of Canada 25(9):1843-1900
Sister taxa: none
Type specimen: SBMNH 342. Its type locality is Great Lakes Carbon Co. quarry, which is in a Messinian marine diatomite in the Sisquoc Formation of California.
Ecology: amphibious carnivore