ABSTRACT

Genus Somniosus le Sueur, 1818. Sleeper sharks. Wide-ranging in Atlantic, Lndian, Pacific, and Arctic Oceans, also off Subantarctic islands, continental and insular shelves (high latitudes) and slopes, also on sea mounts. Five species, falling in two well-marked subgenera, with an additional undescribed long-nosed species of uncertain subgeneric placement off Portugal.