Gadomus colletti, Jordan & Gilbert, 1904

Iwamoto, Tomio, Nakayama, Naohide, Shao, Kwang-Tsao & Table, Hsuan-Ching Ho, 2015, Synopsis of the Grenadier Fishes (Gadiformes; Teleostei) of Taiwan, Proceedings of the California Academy of Sciences 62 (3), pp. 31-126 : 41-42

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).