. . "DD" . . . . "IUCN3.1" . . "The sparsetooth dogfish, Scymnodalatias oligodon, is a very rare sleeper shark of the family Somniosidae, the holotype of which was taken in the subtropical southeast Pacific at a depth of up to 200 m. Its biology is unknown."@en . . . . "Sparsetooth dogfish"@en . .