(Genus):Two rows of photophores present on body; each photophore distinctly separated. No photophores on isthmus. Dorsal origin above or posterior to anal origin. No pseudobranchiae. A series of well-separated, relatively long, slender teeth on maxillary; short teeth in the interspaces. SO present (except in G. bathyphilum). Anal fin rays 21〜32. OA photophores 11〜21; IV 11〜16. (Species):No Serial photophores near dorsal profile of body. OA 13〜15; the first elevated, the others almost level. AC 21〜23, the 2nd and 3rd well elevated. IV 15; the first 5 or 6 forming an upward arch, the others level. A mass of glandular tissue associated with each SO and ORB. Anus just before origin of anal fin. Adipose fin present. Body and head with numerous minute photophores.
Distribution:
Warm waters of three major oceans. Type locality-South of New Guinea. (Fujii)