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The highfin dogfish, Centroscyllium excelsum, is a sleeper shark of the family Dalatiidae, found in the northwest Pacific Ocean on the Emperor Seamount chain between latitudes 50 and 38°N, at depths between 800 and 1,000 m.
The knifetooth dogfish, Scymnodon ringens, is a harmless sleeper shark of the family Somniosidae, found in the eastern Atlantic, from Scotland to Spain, Portugal, and Senegal, and the southwest Pacific from New Zealand, between latitudes 58°N and 15°N, at depths of between 200 and 1,600 m.
The shortnose velvet dogfish, Centroscymnus cryptacanthus, is a sleeper shark of the family Somniosidae, found between latitudes 33°N and 38°S in the southwest Atlantic Ocean, from Uruguay, the eastern Atlantic, from Madeira and Senegal, and also off the west coast of South Africa.
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.
The velvet dogfish, Zameus squamulosus, is a harmless sleeper shark of the family Somniosidae, found around the world between latitudes 64°N and 48°S, from the surface to 2,000 m.