The great lanternshark (Etmopterus princeps) is a shark of the family Etmopteridae found in the northeast and northwest Atlantic.

[2][3] Its name was given because, at the time of its discovery, it was thought to be bioluminescent, but this has been challenged.

[4] Great lanternsharks are slender and small, and are generally found in deep water.

[5] They are black or very dark brown, uniformly, in color, and lack an anal fin.

The dorsal fins have an associated spine.