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> Gadiformes (Cods) > Macrouridae (Grenadiers or rattails)
Etymology: Hymenocephalus:Named for its transparent membrane-like head covering (‘‘hymen head’’) and fragile nature of head bones (Ref. 100825).
Environment: milieu / climate zone / 深さの範囲 / distribution range 生態学
海 底生の漂泳性; 深さの範囲 570 - 1060 m (Ref. 28494). Deep-water
Northwest Pacific: off Hachijojima, Japan (Ref. 559); northern part of Bonin Ridge, on Miluoki and Nintoku Ridges and on Kyushu-Palau Ridge (Ref. 28494).
サイズ / 重さ / 年齢
成熟: Lm ?  range ? - ? cm Max length : 20.0 cm TL オス/雌雄の選別がない; (Ref. 559)
This species is distinguished by the following characters: pelvic fin rays 7-8; pectoral fin rays 14-15; short, barely projecting snout, 15-17% HL; long barbel, 30-35% HL, reaching vertical through center of orbit; large orbit diameter, 35-38% HL; infraorbital width 10-12% HL; moderately long preopercular supporter, with straight rear margin, 6-7% HL; 18-20 gill rakers; ventral striae reaching to ½ distance from pelvic fin bases to periproct; otolith has high predorsal lobe, with colliculi separated, closely placed across collum; otolith length to height (OL:OH), 1.05; total colliculum length to pseudocolliculum length (TCL:PCL), 1.6 (Ref. 98298). Cross section: compressed.
Life cycle and mating behavior 成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984. The fishes of the Japanese Archipelago. Vol. 1. Tokai University Press, Tokyo, Japan. 437 p. (text). (Ref. 559)
Phylogenetic diversity index (参照 82804): PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00214 (0.00109 - 0.00421), b=3.20 (3.03 - 3.37), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
栄養段階 (参照 69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
回復力 (参照 120179): 手段, 1.4年~4.4年の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref. 59153): Low vulnerability (10 of 100). 🛈