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ソコダラ科(Macrouridae),GRENADIERS, WHIPTAILS
トウジン属(Coelorinchus)

TL 442 mm
NSMT-P 40174

ニシトウジン(新称),“nishi-toujin”
  Coelorinchus occa(Goode et Bean, 1886)

Specimens examined:11 (HL 79~131 mm, TL 250+~442 mm).
Counts:BR 6; D (1st) Ⅱ, 7~8; P1 ?, 16~19; P2 7; GR (inner row on 1st arch) 2+6~7.

特 徴:
 (科): 泌尿生殖口は肛門直後にある。背鰭は通常2基。尾鰭はない。鱗は通常微小棘を被る。(属): 第1背鰭第2棘前縁は円滑。肛門は通常臀鰭起部直前に開く。頭部には変形鱗からなる隆起縁が発達する。腹鰭条数は7。(種): 吻は長く鋭く尖り,先端に扁平した矢尻形の強い1棘がある。頭部下面は完全に無鱗。頭部隆起縁は鋭く強い。眼下隆起縁は眼窩中央下に間隙があり,それより前方では鱗列が1列,後方では2列。体側鱗上の小棘列はほぼ平行に並び中央列は著しく肥大する。
分 布:
 北大西洋。
備 考:
 南大西洋産の近縁種C. acanthigerでは吻下面は鱗を被る。 (荒井)
Distinctive characters:
(Family): Urogenital opening immediately behind anus. Usually two dorsal fins. Caudal fin absent. Scales usually armed with spinules. (Genus): Spinous ray of 1st dorsal fin smooth. Anus usually situated in front of anal fin. Head ridges of modified scales developed. Pelvic fin rays 7. (Species): Snout long, sharply pointed; a strong, arrow-head shaped spine present on its tip. Underside of head completely naked. Head ridges very strong; suborbital ridge with a gap below middle orbit, portion anterior to gap with a single scale row and posterior portion in two rows. Spinules on body scales arranged in subparallel rows with distinct enlarged median keel.
Distribution:
 North Atlantic.
Remarks:
 In C. acanthiger (South Atlantic species), underside of snout is covered with scales. (Arai)

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