サギフエ科 Macroramphosidae                          Snipefishes

 





SNFR 19306, 128 mm SL.


21 カワリサギフエ

Notopogon xenosoma Regan, 1914               Longspine Bellowfish, Orange Bellowfish

 

Specimens examined: 5 (SNFR 19292–19294, 19305, 19306; 113–146 mm SL), 618–792 m depth.

Counts: D VII, 15–16; A 17–18; P1 14–16; P2 I, 4; GR 17–21 (total); V 9+15=24. Measurements: head length 35.9–44.9% SL; body depth at pectoral-fin origin 37.3–43.0% SL; body depth at anus 41.6–46.4% SL; first dorsal-fin-base length 16.8–20.1% SL; second dorsal-fin-base length 11.3–14.6% SL; anal-fin-base length 13.9–17.8% SL; second dorsal-fin-spine length 29.8–32.9% SL; predorsal length 80.0–95.4% SL; pre-anus length 64.4–78.2% SL; pectoral-fin length 21.2–26.9% SL; pelvic-fin length 5.9–7.4% SL; caudal-peduncle depth 5.9–7.3% SL; caudal-peduncle length 11.2–13.5% SL; eye diameter 24.5–27.1% HL; interorbital width 12.0–15.3% HL; snout length 49.2–54.9% HL.

 

計数形質:背鰭7棘,15–16軟条;臀鰭17–18軟条;胸鰭14–16軟条;腹鰭1棘,4軟条;鰓耙数17–21(総数);脊椎骨数9+15=24計測形質:頭長35.9–44.9% SL;胸鰭始部における体高37.3–43.0% SL;肛門における体高41.6–46.4% SL;第1背鰭基底長16.8–20.1% SL;第2背鰭基底長11.3–14.6% SL;臀鰭基底長13.9–17.8% SL;第2背鰭棘長29.8–32.9% SL;背鰭前長80.0–95.4% SL;肛門前長64.4–78.2% SL;胸鰭長21.2–26.9% SL;腹鰭長5.9–7.4% SL;尾柄高5.9–7.3% SL;尾柄長11.2–13.5% SL;眼径24.5–27.1% HL;両眼間隔12.0–15.3% HL;吻長49.2–54.9% HL.

特 徴 体は楕円形で,強く側扁する.吻部は管状で著しく長く,その先端部にある口に歯はない.背鰭始部と臀鰭始部はともに体の後半部に位置する.第2背鰭棘は後縁に鋸歯があり,長大で,その長さは体長の約1/3.胸鰭は細長く,斜め上方を向く.腹鰭は小さく,その長さは眼径よりも短い.尾鰭の後縁はやや円い.鱗は小さい櫛鱗で硬く,表皮に固着して,剥がれにくい.峡部から腹鰭にかけての腹中線上には骨質隆起が存在する.胸鰭上方の背側部に骨質板がある.項部は隆起し,そこに密集した剛毛がある.側線はない.体と頭部は一様に赤橙色.

分 布 太平洋南西部(オーストラリア南部,ニュージーランド,ニューカレドニア),インド洋南部(マダガスカル,セントポール島),南アフリカ(Duhamel, 1995).

備 考 本種はミナミサギフエCentriscops humerosus (Richardson, 1846)に類似するが,本種は項部に長い剛毛が密集した領域をもつこと,および体側に明瞭な斜帯がないことで異なる(ミナミサギフエの項部には短い絨毛状の突起が密集しており,体側に明瞭な斜帯がある).

(岡本)

 

Description  Body oval and strongly compressed. Snout tube-like and extremely long, mouth at its tip toothless. Origins of dorsal and anal fins located on posterior part of body. Second dorsal-fin spine with serrations on posterior margin, long and thick, its length about 1/3 of SL. Pectoral fin slender, directed obliquely upward. Pelvic fin small, its length shorter than eye diameter. Posterior margin of caudal fin moderately rounded. Scales small, ctenoid, stiff, and adhered to skin, not deciduous. Midline of ventral margin between isthmus and pelvic-fin base forming a bony ridge. Bony plates present on dorsolateral surface of body above pectoral fin. Nape raised, with a dense patch of bristles. Lateral line absent. Body and head uniformly reddish orange.

Distribution  Southwestern Pacific (southern Australia, New Zealand, and New Caledonia) and South Indian Oceans (Madagascar and St. Paul Island); South Africa (Duhamel, 1995).

Remarks  This species is similar to Centriscops humerosus (Richardson, 1846) but differs by having a dense patch of bristles on the nape and lacking distinct oblique bands on the side of body (vs. having a dense patch of downy-hair-like projections on the nape and distinct oblique bands on the side of body in C. humerosus).

(M. Okamoto)

 



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