Animals are believed to range as far south as the Sea of Japan and as far north as 65 degrees north in Alaska and in particular in Prince William Sound during the annual salmon run.
The smallmouth knifetooth dogfish, Scymnodon obscurus, is a harmless sleeper shark of the family Somniosidae, found in the central Atlantic between latitudes 65°N and 36°S, from the surface to 1,450 m.
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