Specimens examined:6 (SL 127〜152.5 mm). Depth:730〜850 m.
Counts and measurements:D 9〜10; A 18〜20; P1 11. HL 17.4〜19.3% of SL, eye diameter 6.6〜7.3, body depth 15.0〜19.0.
(Family):Body compressed. Mouth small but eye not tubular. Pupil elongate horizontally with an aphakic space anteriorly. Pectoral fin low on body. Right and left gill membranes widely fused each other. Dorsal fin located above pelvic fin. Adipose fin present. No teeth on tongue. No photophores on head and body. Scales remarkably deciduous. Lateral line indistinct. (Genus):One genus, Bathylagus. (Species):Gill opening not extending halfway up the side of body. Head and body black in fresh; scale pocket markings jet black. Lateral line scales about 50. Eye diameter 5.9〜8.0% of standard length*.
Distribution:
Tropical and subtropical waters of Atlantic and Pacific oceans. Type locality-41°30′N, 45°57′W.