Alexeterion Vaillant 1888 Barathronus is a genus of deep-sea fish that are placed in the family Aphyonidae (blind cusk eels)[2][3] or family Bythitidae (brotulas),[1][4] depending on the source.

Barathronus are viviparous deep-sea fish.

However, a juvenile Barathronus pacificus has been recorded in shallow waters.

[5] Based on the stable oxygen isotope composition of otoliths, at least one species, Barathronus maculatus, has a pelagic larval stage, followed by an ontogenetic vertical migration to deeper waters.

[6] There are currently 10 recognized species in this genus, although the exact species differ between the FishBase[2] and the Catalog of Fishes:[1]