Coryphaenoides nasutus Günther, 1877

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 : 71-72

Coryphaenoides nasutus Günther, 1877

Figures 10A–B .

Coryphaenoides nasutus Günther, 1877:440 (2 syntypes, BMNH 1887.12.7. 78–79; 1 syntype?, MNHN 1890–0123; “south of Yedo” [Tokyo], Japan, 34°07ʹN, 138°00ʹE, Challenger sta. 235, 565 fm [1033 m]).— Gilbert and Hubbs, 1916:168 (45 spec., Japan: Hokkaido to e. coast Kyushu; 13 Albatross sta., 250–614 fm [457–1123 m]).— Okamura, 1970:140–143, pl. XXXI, text-fig. 56 (38 spec., 155–470 mm TL; Hokkaido to East China Sea, 625–1180 m).— Okamura in Okamura et al., 1982:165, 351, fig. 99 (8 spec., 136–234 mm TL; Kyushu-Palau Ridge).— Sawada in Amaoka et al. 1983:113, 195, fig. 64 (5 spec., 199–391 mm TL, 815–1100 m).— Okamura in Masuda et al., 1984:96, pl. 82F (compiled).— Yatou in Okamura and Kitajima, 1984:219, 364, fig. 155 (5 spec., 265–470 TL; Kyushu-Palau Ridge, 815–1000 m).— Iwamoto, 1990:216 (descr.).— Shao et al., 2008: table 2 (5 spec., NET, SET, 979–1268 m; first record from Taiwan).

Macrurus nasutus : Günther, 1887:132, pl. 30, fig. B (descr.; type illustrated).

MATERIAL EXAMINED (9 spec.).— NET: ASIZP 64113 (2, 240+-338+ TL) , CP 242; ASIZP 65576 (1, 288+ TL), CP 197. SET: ASIZP 65511 (1, 425 TL), CP 127. SCS: ASIZP 65622 (1, 415 TL), CD 226. Non-types and possible types: BMNH 1887.12 .7.80 [1], BMNH 1889.6.30.8–9 [2], NMI block reg. no. 114.1899 [1] .

DISTINGUISHING FEATURES.— 1D II 9–11; P i18–i23; V 9–10; GR-I (inner) 1–2+7–9, GR-II outer/inner 1–2+8/1–2+7–8; scales below midbase 1D 4.5–5.5, below 2D origin 7.0–7.5, over distance equal to pre-1D len. 36–40. Snout length 27–32% HL; orbit 24–30%; interorbital width 20–24%; upper jaw 29–36%; barbel 5–8%; greatest body depth 75–97%; interdorsal [1D-2D] space variable 90–114% [2D rays rudimentary anteriorly]; length V 49–69%. Snout acutely pointed, extending short distance in front of mouth. Second spinous ray of 1D serrated, slightly produced (95–125% HL); outer V ray slightly produced. Upper jaw extends posteriorly to below middle of orbit. Head almost fully scaled except for gular and BR membranes; scales above suborbital ridge thickened and modified; a stout conical tubercle at snout tip; body scales covered with needlike spinules in convergent rows.

DISTRIBUTION.— Pacific coast of Japan from Hokkaido to East China Sea, and Taiwan from e. coast to South China Sea. Published depth range 625–1180 m, but in Taiwan, specimens collected in 979–1268 m.

REMARKS.— Shao et al. (2008) first recorded C. nasutus from Taiwan and the South China Sea based on the current specimens. This species is similar in many features to C. microps and C. marginatus but has a larger, broader head, more strongly pointed snout armed with a stouter terminal scute, V rays 9 or 10 (compared with 7 or 8), and an acute preopercular ridge and angular preopercular margin.

Figures

FIGURE 10. Coyphaenoides nasutus Gunther, 1877. A. ASIZP 64113, 338+ mm TL., fresh. B. ASIZP 65576, 288+ mm TL, preserved.