Gadomus colletti Jordan and Gilbert, 1904

Gadomus colletti Jordan and Gilbert, 1904:603–604 (holotype USNM 50930, Albatross sta. 3721, Suruga Bay, Japan; 207–250 fm [379–457 m]).— Gilbert and Hubbs, 1916:154–155 (descr.; 4 spec., 68–302 TL; Suruga Gulf, 211–293 fm [386–536 m]); Gilbert and Hubbs, 1920:392 (in key).— Okamura, 1970:23–26, pl. I, fig. a; text-fig. 12A, 13 (descr., 44 spec., 177–322 TL); s. Japan, 360–547 m).— Howes and Crimmen, 1990:199 (descr. based on holotype and USNM spec.).— Chiou et al., 2004b:43, fig. 8 (2 spec., NET).— Shao et al., 2008: table 2 (5 spec., NET, SCS).

Bathygadus colletti: Weber, 1913:172 (listed).

MATERIAL EXAMINED (6 spec.).— NET: ASIZP 61223 (1, 79 HL, 363 TL); Da-xi; ASIZP 61224 (1, 82.7 HL, 382 TL); Da-xi; ASIZP 65636 (1, 68.1 HL, 352 TL); CD 214, 488– 1027 m; Da-xi . ASIZP 70251 (1, 90 HL, 346 TL); Da-xi. SWT: ASIZP 65513 (1, 200+ TL); CP 130, 709– 728 m. Other specimens: Japan : HUMZ 37408 (1, 29.8 HL, 146+ TL).

DISTINGUISHING FEATURES.— A species of Gadomus with chin barbel about 2/3 of HL or slightly longer; elongated ray in 1D, P and V often longer than HL; 1D II,10–11; P (i16) i18–i21; V 8; outer gill rakers lathlike but relatively short, bluntly tipped, (4–5)+(8–21) (ASIZP 61224 had 1 rudiment and 5 developed rakers on upper arm, 16 developed and 3 rudiments on lower arm); pyl. caeca small, numerous, about 95 to 165. Interorbital width 14–18% HL; orbit diameter 22–23%; upper jaw length 51–58%; chin barbel 57–91%; 1D spinous ray less than twice HL. Color relatively pale, mouth and gill cavity dark but paler on outer margins; lips and barbel whitish; fins dusky to blackish, dorsal fins lighter basally.

DISTRIBUTION.— Southern Japan to Taiwan (NET, SWT) in 488–1027 m.

REMARKS.— This species was first recorded from Taiwan by Chiou et al. (2004b:43). Our four specimens appeared to have a somewhat shorter barbel (57–91% of HL) than reported by others. Okamura (1970:24) recorded their length as 0.9–1.2 into HL in 44 specimens from Japan, “about as long as, or a little shorter than, length of head” in 10 specimens from the Kyushu-Palau Ridge and Tosa Bay (Okamura 1982:345), and 75–91% HL in five specimens from the Okinawa Trough (Okamura 1984:356).