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| Common names: man-of-war fish (English), derivante (Espanol), pez (Espanol) |
Nomeus gronovii (Gmelin, 1789)
Body elongate; eye large, with a fatty ring around it; mouth small, usually ends before eye; teeth small, conical, ~ 1 row on jaws; teeth on center and sides of roof of mouth, and on bases of gill arches, but none on tongue; opercle thin, with 2 flat spines; gill rakers 8 + 15 -19; 2 scarcely separated dorsal fins, IX-XII + I, 24-28, spines fold into a groove, its origin behind (in small specimens directly over) pectoral origin, longest spine slightly longer than longest ray; anal fin I-II, 24-29; pelvics insert before or under pectoral base, fan shaped, attached to belly along entire length, folds into a groove; pectoral rays 19-24, fin pointed and wing-like; scales on head in a broad band, extending before eyes; lateral line complete, high along back. Juvenile with greatly enlarged pelvic fins, round pectoral, deeply forked tail; lateral line ends under end of dorsal fin base.
Juveniles: silvery with black bars and spots, pelvic fins black with white blotches; adults: uniformly dark brown.
Size: reaches 40 cm.
Inhabits surface layers of the high seas; young are associated with drifting Man-of-War siphonophores (Physalia).
Depth: 0-20 m.
Worldwide in warm temperate and tropical seas. The tip of Baja California to the eastern Gulf of California to Peru and the oceanic islands.