Great lanternshark

The great lanternshark (Etmopterus princeps) is a shark of the family Etmopteridae found in the northeast and northwest Atlantic. Its name was given because, at the time of its discovery, it was thought to be bioluminescent, but this has been challenged.

Description
Great lanternsharks are slender and small, and are generally found in deep water. They can grow up to 75 cm. They are black or very dark brown, uniformly, in color, and lack an anal fin. They live at depths between 570 m and 2200 m. The dorsal fins have an associated spine.