Body covered with large, heavy platelike scales; phosphorescent (luminous bacteria) light organs on lower jaw; pelvic fin with one large spine and two to four small soft rays; two dorsal fins, the first with 4-7 strong spines alternating from side to side and the second with 9-12 soft rays; anal fin with 10-12 soft rays (no spines); pectoral fin with 13-15 rays; branchiostegal rays eight. Maximum length about 21 cm.
Two genera, Cleidopus and Monocentris, with four species (Kotlyar, 1996). They occur primarily at depths of 30-300 m.
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