ソコダラ科
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ソコダラ科(Macrouridae),GRENADIERS, WHIPTAILS
ネズミダラ属(Nezumia)

HL 59 mm, TL 318+ mm
NSMT-P 40180

フタコブネズミダラ(新称),“futakobu-nezumidara”
  Nezumia cyrano Marshall et Iwamto, 1973

Specimens examined:13 (HL 55〜65 mm, TL 296+〜330+ mm).
Counts:BR 7; D (1st) U, 9〜11; P1 21〜24; P2 9 (rarely 8 or 10); GR (inner row on 1st arch) 1〜2+7〜9.

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): 肛門は腹鰭起部と臀鰭起部の中間又はそれより前位。腹鰭基底間付近に黒色無鱗の発光器がある。第1背鰭第2棘前縁は鋸歯。第1鰓弓内列の鰓耙数は12以下。吻前縁に沿う暗褐色帯がない。(種): 腹鰭条数は通常9(稀に8又は10)。吻端に2個の顕著な瘤状変形鱗がある(図)。変形鱗からなる眼下隆起縁が発達する。吻下面は鱗を被る(図)。喉部・鰓条膜は無鱗。上顎長は頭長の24.0〜27.4%,ヒゲ長は5.5〜9.1%,両眼間隔は17.6〜22.1%。
分 布:
 中部西大西洋。
備 考:
 近縁種のN.suilla, N. bairdii, N. aequalisでは吻端の2個の変形鱗は肥大しない。 (荒井)
Distinctive characters:
(Family): Urogenital opening immediately behind anus. Usually two dorsal fins. Scales usually armed with spinules. (Genus): Anus situated midway between pelvic bases and origin of anal fin or slightly anterior. A small black dermal window of light organ between pelvic bases. Second spinous ray of 1st dorsal fin serrated. Gill rakers on 1st arch less than 12. No dark band along anterolateral margin of snout. (Species): Pelvic fin rays 9 (rarely 8 or 10). Two large scutes present at snout tip (see Fig.). Suborbital ridge developed. Underside of snout scaly (see Fig); gular part and branchiostegal membrane naked. Upper jaw 24.0〜27.4%, interorbital 17.6〜22.1%, barbel 5.5〜9.1% of HL, respectively.
Distribution:
 Middle western Atlantic.
Remarks:
 N. suilla, N.bairdii, and N. aequalis lack enlarged scutes at snout tip. (Arai)

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