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Author: Gilbert & Hubbs, 1920

Hymenocephalus gracilis Gilbert & Hubbs, 1920

Diagnosis: body slender and cylindrical, head as wide as deep, the dermal bones thin and weak. Snout bluntly rounded; mouth large, upper jaw reaching back beyond eye, oblique and subterminal, teeth small, none enlarged, the band in lower jaw narrower than that in upper; gillrakers 16-18, chin barbel present. First dorsal fin with 11-13 finrays, the second finray weakly denticulated; second dorsal fin beginning some distance behind, with very short finrays; pectoral fin with 15-18 finrays; pelvic fin with 7-9 finrays. Scales large, thin and cycloid; but almost always shed. Pyloric caeca 11-17 (usually 13). Light organ along belly elongate, with an external circular lens-shaped body at each end. Colour: head and most of lower surface of body silvery, a silver streak down midflanks, as well as a line of point spots (sometimes with other irregular lines of spots above and below); narrow black streaks run across leading edge of snout, upper margin of orbits, inner margins of lips and inner edges of lower jaw; fins clear or dusky, bases of paired fins black; mouth and gill cavity blackish; transverse striated lines on gular membrane and similar silver and dark lines on sides of isthmus, shoulder and belly. Size: to 13 cm TL.

Habitat: benthopelagic (at 160 345 m off Morocco). Food: planktonic crustaceans. Reproducfion: no data.

Distribution: Atlantic off Morocco. Elsewhere, tropical western North Atlantic, also western Pacific (southern Japan, South China Sea off Luzon).

Eggs, larvae and young stages. No data.
Otoliths (sagitta). No data.

Graceful grenadier (Hymenocephalus gracilis)