Himantolophus sagamius Tanaka 1918

Himantolophus sagamius (Tanaka, 1918)

Fig. 11

Corynolophus sagamius Tanaka, 1918:491, pl. 134, fig. 377 (type locality: Sagami Sea, Japan). Himantolophus sagamius (Tanaka, 1918): Bertelsen & Krefft, 1988:39. Pietsch, 2009:336.

Material. HUMZ 194261 (1, 42.6), st. 31, 8°35.6'S, 110°43.3'E – 8°35.5'S, 110°41.8'E, off Java, 605–607 m, 14 May 2005. HUMZ 194599 (1, 51.9), st. 103, 8°17.5'S, 109°44.1'E – 8°18.0'S, 109°41.6'E, off Java, 612–632 m, 16 Jul. 2005.

Description. Dorsal-fin rays 5; pectoral-fin rays 17; anal-fin rays 4; caudal-fin rays 9. Head length 41.2– 46.7% SL; head depth 49.1–58.7; head width 25.6–29.1; illicial length 33.6–36.0; escal width 6.8–7.5; upper jaw length 30.8–34.0.

Body short, globular anteriorly, compressed posteriorly. Sphenotic spines well developed, directed upward. Papillae less developed on snout and chin. Twenty-nine dermal spines on body in 42.6 mm specimen and 44 in 51.9 mm specimen, 2 or 3 on each pectoral-fin base. Teeth numerous, in about 4–5 rows, those on lower jaw larger than those on upper jaw. Vomerine teeth not detectable. Papillae not developed on snout and chin. Dermal spines loosely covering upper half of illicial stem and densely covering esca, including all appendages, in 42.6 mm specimen; densely covering illicial stem (except for base) and esca, including all appendages, in 51.9 mm specimen.

Esca of 42.6 mm specimen: a single anterior appendage, length 17.8% SL, bifurcated distally, branches subequal; single posterior appendage, length 18.1% SL, bifurcated distally, one branch longer than other; a pair of short distal appendages, length 3.5% SL, each with 2 bud-like side branches; four escal lobes, all very low, pigmented internally; two pairs of appendages at base of esca, those on upper pair longer, length 27.0% SL, bifurcated distally, those on lower pair simple, length 17.1% SL.

Esca of 51.9 mm specimen: single simple anterior appendage, length 9.2% SL; single simple posterior appendage, 8.5% SL; one pair of short distal appendages, length 1.3% SL, lower than escal lobes; four flat escal lobes; two pairs of appendages at base of esca, all simple, those on upper pair length 15.6% SL and on lower pair length 14.6% SL.

Body pale gray to brownish gray, both jaws darker. All fins transparent, except for lightly pigmented rays of caudal-fin.

Distribution. Previously only known from Pacific Ocean, this is the first record of the species from the eastern Indian Ocean. Some specimens examined in Bertelsen & Krefft (1988) were collected from 613–ca. 1300 m, whereas the Indonesian specimens were collected at 605– 632 m.