Grenadiers (Teleostei: Gadiformes: Macrouridae) of Japan and adjacent waters, a taxonomic monograph Author Nakayama, Naohide 0000-0001-9556-1537 Department of Marine Biology, School of Marine Science and Technology, Tokai University, 3 - 20 - 1 Orido, Shimizu, Shizuoka 424 - 8610, Japan ® naonakayama @ tsc. u-tokai. ac. jp or ® gadiformes@gmail.com text Megataxa 2020 2020-11-05 3 1 1 383 journal article 56026 10.11646/megataxa.3.1.1 1ece557d-068b-465b-809e-0fc1110035b3 2703-3090 6422776 7A95A1DD-0372-4FAC-BA3B-1896386BC710 Lucigadus nigromarginatus ( Smith & Radcliffe in Radcliffe, 1912 ) [No Japanese name] ( Figs. 157–159 ; Appendix 3-9E) Macrourus nigromarginatus Smith & Radcliffe in Radcliffe, 1912:114 , pl. 24, fig. 2 [original description; holotype : USNM 72930 , from near Simaluc Island, 5º33′15ʺN , 120º15′30ʺE , in 303 ftm ( 554 m ); numerous paratypes ] . Lucigadus lucifer (not Smith & Radcliffe in Radcliffe 1912 ): Chiou et al. 2004a:45 , fig. 15 (brief description; 1 spec. from Nanfang-ao ; first record from Taiwan) . Ventrifossa lucifer (not Smith & Radcliffe in Radcliffe 1912 ): Chiou et al. 2004a : table 1 (listed; Taiwan) . Ventrifossa nigromarginata : Chiou et al. 2004a : table 1 (listed; first record from Taiwan) . Lucigadus nigromarginatus : Shao et al. 2008b : table 2 ( 2 spec. listed from northeastern and southwestern Taiwan ); Iwamoto et al. 2015:84 (brief description; 9 spec. from northeastern and southwestern Taiwan , South China Sea , Philippines , and New Caledonia ). Diagnosis. A species of Lucigadus with 10–11 pelvicfin rays; first dorsal fin blackish over anterior 3–4 rays; distal margin of anal fin prominently marked with black anteriorly; snout length 24–28% HL; interorbital width 22–31% HL; height of first dorsal fin 92–107% HL; barbel length 20–26% HL; scales below second dorsal-fin origin 7–9.5; branchiostegal membranes heavily scaled ventrally; body pale overall, without broad dark bands. [Modified from the key to Lucigadus species provided by Iwamoto & Okamoto (2015:372) .] Material examined. 2 specimens . Taiwan : BSKU 98982 (1, 35.2 mm HL, 175+ mm TL), Dong-gang fish market, Pingtung , bottom trawl, coll. H.-C. Ho , 16 Nov. 2007 ; FAKU 204468 (1, 31.0 mm HL, 156+ mm TL), Dong-gang fish market, Pingtung , bottom trawl, coll. N. Nakayama , 27 Feb. 2017 . Counts and measurements. For counts and measurements see Iwamoto et al. (2015:84) and Iwamoto & Okamoto (2015 : table 1). FIGURE 157. Fresh specimen of Lucigadus nigromarginatus . FAKU 204468, 31.0 mm HL, 156+ mm TL, Dong-gang fish market, southwestern Taiwan, South China Sea. (A) Lateral view; (B) dorsal and (C) ventral views of the head and trunk. [Photos: N. Nakayama] FIGURE 158. Preserved specimen of Lucigadus nigromarginatus . BSKU 98982, 35.2 mm HL, 175+ mm TL, Dong-gang fish market, southern Taiwan, South China Sea, ca. 200–300 m depth. (A) Lateral view; (B) dorsal and (C) ventral views of the head and trunk. [Photos: N. Nakayama] Size. To about 20 cm TL ( Iwamoto & Okamoto 2015 ). Distribution. Known only from the western central Pacific including the Philippines ( type locality), Indonesia , China , and Taiwan , at depths of 247–717 m ( Radcliffe 1912 ; Gilbert & Hubbs 1920 ; Weber & de Beaufort 1929 ; Shao et al. 2008a , 2008b ). No specimens have been collected within Japan’s EEZ (Appendix 3-9E). Common in Taiwan . Remarks and comparisons. For further morphological information see the original description given by Smith & Radcliffe ( in Radcliffe 1912 ). In the key to Lucigadus species provided by Iwamoto & Okamoto (2015) , L. nigromarginatu s is most similar to L. acrolophus Iwamoto & Merrett, 1997 . According to their study, L. nigromarginatus differs from L. acrolophus in having a shorter snout (24–28% HL vs. 28–32%), a lower first dorsal fin (92–107% HL vs. 108–129%), an apical black spot on the first dorsal fin (vs. anterior third of the fin membrane blackish), and a blackish anterodistal margin of the anal fin (vs. absent).