Cyema atrum

Cyema is a monospecific genus of marine ray-finned fish belonging to the monotypic family Cyematidae. The only species in the genus is Cyema atrum, the arrow eel, bobtail eel, bobtail snipe eel or deepwater eel. This species has circumglobal distribution.

==Taxonomy== Cyema was first proposed as a genus in 1878 by the German-born British ichthyologist Albert Günther when he described its only species Cyema atrum. The type locality of C. atrum was given as the South Pacific from Challenger station 295 from a depths of and the Antarctic Ocean from Challenger station 158 from a depth of . In 1912 Charles Tate Regan classified this genus in the family Cyematidae, this genus is the only genus classified in that family. Formerly, the genus Neocyema was classified within this family but it is now classified in the family Neocyematidae. This family is classified within the suborder Anguilloidei of the eel order Anguilliformes.