Coelorinchus leptorhinus Chiou, Shao and Iwamoto, 2004

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 : 59-61

Coelorinchus leptorhinus Chiou, Shao and Iwamoto, 2004

Caelorinchus leptorhinus Chiou, Shao and Iwamoto, 2004a:299, figs. 1–3 (holotype, ASIZP 061344 and 23 paratypes, Da-xi, ne. Taiwan, 24°54.63ʹN, 122°03.49ʹE, 400–600 m) .

Coelorinchus leptorhinus : Shao et al., 2008: table 2 (23 spec., NET, SWT, 100–650 m) .

MATERIAL EXAMINED (54 spec.).— NET: ASZIP 58636 (1, 146 TL) , Da-xi; ASIZP 58648 (2, 285–311 TL) , Da-xi; ASIZP 60246 (1, 192 TL) , Da-xi; ASIZP 60247 (1, 310 TL) , Da-xi; ASIZP 61344 (1, holotype, 800 TL) , Da-xi; ASIZP 61345 (1, paratype, 380 TL) , Da-xi; ASIZP 61346 (10,

paratype, 142–176 TL), Da-xi; ASIZP 61347 (2, paratypes, 480–640 TL) , Da-xi; ASIZP 64288 (1, 400 m, 146 TL), Da-xi ; ASIZP 65569 (1, 567 TL), Da-xi ; ASZIP 65571 (1, 407 TL), Da-xi ; ASIZP 65642 (1, 370 TL), KSD sta.4 ; ASZIP 65646 (1, 230+ TL), Da-xi ; ASZIP 65647 (1, 308 TL), KSD sta.4 ; ASZIP 65649 (1, 261 TL), KSD sta .; ASIZP 65781 (1, 346 TL), Da-xi ; ASIZP 66253 (1, 352 TL), Da-xi ; ASIZP 66917 (2, 212–224 TL), CP 248, 526 m ; ASIZP 66939 (1, 133 TL),Da-xi ; ASIZP 70214 (2, 334–394 TL), Da-xi ; ASIZP 70252 (1, 147 TL), Da-xi ; ASIZP 70692 (18, 200–375 TL), Da-xi . SWT: ASIZP 66405 (1, 240 TL), Dong-gang ; ASIZP 65628 (1, 546 TL), CD 233, 448– 526 m.

DISTINGUISHING FEATURES.— 1D II, 8–9; P i17–i18; GR-I (inner) 6–8 total; scales below midbase 1D 5.5–7.5, below 2D 5.5–7.5; pyl.caeca 42–48. Snout long, narrow, pointed in lateral view, tip rounded, length 39–46% HL, anterolateral margin of snout completely supported by bone; orbit 16–19% HL; upper jaw 26–29% HL. Nasal fossa scaly, underside of snout naked, but finely scaled posteriorly on head; spinules on body scales in 5–8 sharp, slightly divergent ridge rows. Light organ short, Group II of Iwamoto (in Cohen et al. 1990); anus removed from A origin. Ground color brown, bluish on belly and halfway onto chest; underside of head, mouth, and gill cavities dark; fins generally dusky to blackish. Attains more than 850 mm TL.

DISTRIBUTION.— Apparently endemic to Taiwan ( NET, SWT, SCS) . The species is most abundant in 300–400 m off s. Taiwan and 400–800 m in ne. Taiwan .

REMARKS.— Shen et al.’s (1993) record of C. tokensis was a misidentification of C. leptorhinus . The species is abundant in the bycatch of the deepwater trawl fisheries off Da-xi ( NET). It is most closely similar to the Philippines species C. macrorhynchus Smith and Radcliffe, 1912 in having a notably long snout, long jaws, relatively long barbel, and similar light organ. The main differences between the two species lie in C. leptorhinus having the underside of snout naked and having a slightly shorter snout (preoral length 35–40% HL cf 40–45%).

Coelorinchus longissimus Matsubara, 1943 Coelorhynchus longissimus Matsubara, 1943:140, fig. 5 (holotype, FAKU 1592 [apparently lost]; Kumano-

Nada , Japan).— Okamura, 1970:165–168, pl. XXXV, text-fig. 67 (48 spec., 200–357 mm TL; s. Japan, 280–400 m) .

Coelorinchus longissimus : Okamura in Masuda et al., 1984:97, pl. 82–K (compiled).— Yatou in Okamura and Kitajima, 1984:223, 366, fig. 159 (5 spec., 175–325 mm TL; Okinawa Trough).— Shao et al., 2008: table 2 (3 spec., NET, SWT, 100–650 m).— Kim et al., 2005:172 ( Korea; compiled).

Caelorinchus longissimus : Nakabo, 2003:430 (compiled).— Chiou et al., 2004b:43–44, fig. 10 (2 spec., NET, SWT) .

MATERIAL EXAMINED (9 spec.).— NET: ASIZP 61337 (1, 202 TL), Da-xi ; ASIZP 70695 (2, 212–235 TL), Da-xi . SWT: ASIZP 57602 (1, 182 TL), Dong-gang ; ASIZP 61338 (1, 262 TL), Dong-gang ); ASIZP 70614 (1, 165 TL), Dong-gang. Other material: Philippines : ASIZP 68091 (1, 84 TL), Aurora, 184–200 ; ASIZP 68423 (2, 100–103 TL), Aurora, 184– 200 m.

DISTINGUISHING FEATURES.— 1D II, 8–10; P i16–i20; GR-I (inner) 6–9 total; scales below midbase 1D 3.0–4.5, below 2D 3.5–4.5; pyl.caeca 16–23. Snout sharply pointed, length 42–45% HL, anterolateral margin snout incompletely supported by bone; orbit 24–27% HL; upper jaw 23–28% HL. Most of nasal fossa and broad areas atop snout naked; underside of head naked except along anterolateral margin of snout where scales broadly overlap edge; spinules on body scales short, weak, slender in 6–14 parallel to slightly divergent rows. Light organ long, extends forward to near isthmus, Group IV of Iwamoto (in Cohen et al. 1990). Dorsum gray with faint irregular blotches, remainder of body silvery; fins dusky, 1D with blackish membrane behind long spinous ray; median nasal process black; mouth white, gill cavities blackish; gular and branchiostegal membranes heavily peppered; underside of snout clear, mostly lacking melanophores except along outer margins. Attains at least 357 mm TL.

DISTRIBUTION.— Pacific coast of s. Japan from Suruga Bay s. into the East China Sea (Okinawa Trough), ne. Taiwan, the South China Sea off Taiwan, and in the Philippines, in 280–400 m.

REMARKS.— This species is closely similar to C. kamoharai , differing only in the slender scale spinules arrayed in many divergent rows (as compared with short broad spinules in quincunx pattern) and paler, slightly different pattern of blotches on the body.