Cystophora cristata (Erxleben, 1777). Syst. Regni Anim., 1:590.
TYPE LOCALITY: "Habitat in Groenlandia australiori et Newfoundland". [S Greenland and Newfoundland].
DISTRIBUTION: N Atlantic and Arctic oceans, from Newfoundland (Canada) to S Greenland, Svalbard and Novaya Zemlya (Russia); occasionally south to Portugal and Florida (USA).
SYNONYMS: borealis Nilsson, 1820; dimidiata Riippell, 1842.
COMMENTS: Reviewed by Kovacs and Lavigne (1986, Mammalian Species, 258).