A genus of slender deepwater fishes with rows of photophores along the ventral surface; with 7 species worldwide, and three found in Australian waters.
Species have the following characteristics: Rows of light organs (photophores) along the ventral surface; eye small to moderate in size; snout equal to or longer than orbit; mouth oblique, maxillary almost reaching rear edge of preopercle, premaxillary about half as long as toothed part of maxillary; maxillary teeth in 1 row with longer teeth separated by smaller teeth; dorsal adipose fin present or absent; anal-fin origin below or in advance of dorsal-fin origin; anal-fin rays 22–24; light organs (AC) from anal-fin origin to tail 20–21; no photophores on isthmus.
Gill, T.N. 1883. Diagnosis of new genera and species of deep-sea fish-like vertebrates. Proceedings of the United States National Museum 6(380): 253-260
Miya, M. & Nishida, M. 2000. Molecular systematics of the deep-sea fish genus Gonostoma (Stomiiformes: Gonostomatidae): two paraphyletic clades and resurrection of Sigmops. Copeia 2000(2): 378-389