分類 / Names
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板鰓亜鋼(サメとエイ類) (sharks and rays) >
Squaliformes (Sleeper and dogfish sharks) >
Somniosidae (Sleeper sharks)
Etymology: Scymnodon: scymnus, an ancient name for some kind of shark, derived from a Greek word meaning young animal, cub or whelp; odon (Gr.), tooth, referring to large, triangular cutting teeth on lower jaw of S. ringens (See ETYFish); ichiharai: In honor of marine biologist (specializing in whales) Tadayoshi Ichihara (d. 1981), Tokai University (Tokyo, Japan), who suggested that the authors study this shark (See ETYFish).
Eponymy: Dr Tadayoshi Ichihara (d: 1981) was a scientist at the Whales Research Institute, Tokyo, Japan. [...] (Ref. 128868), visit book page.
More on authors: Yano & Tanaka.
Environment: milieu / climate zone / 深さの範囲 / distribution range
生態学
海 深海浮遊性; 深さの範囲 400 - 830 m (Ref. 131163). Deep-water
Indo-West Pacific: Andaman Is., Japan and Taiwan.
サイズ / 重さ / 年齢
成熟: Lm ? range ? - ? cm
Max length : 101 cm TL オス/雌雄の選別がない; (Ref. 131163); 151.1 cm TL (female)
簡単な記述
検索表 | 形態学 | 形態計測学
This large brownish-black deep-water shark is distinguished by the following: body is subcylindrical; head depressed, flat above and broad; short snout; dermal denticles along the trunk with pedicelated crowns, supporting dorsal leaf-like blades, with posterior margin of blade straight, slightly undulated, or serrated; only oblique cusps on the lower jaw teeth, without any symmetrical symphysial tooth and outer margin of main cusp almost erect; first and second dorsal fin with a small exposed spine; narrow paddle-shaped pectoral fin (pectoral fin posterior margin 4.6-6.9 % TL); pelvic fin about equal to the second dorsal fin; deep caudal fin, forked barely, with apex of the upper lobe moderately rounded; no anal fin; eyes and spiracle large; upper teeth much smaller than lower, distinct as small spear-like smooth edges in upper teeth and lower triangular (Ref. 125648, 131163).
Cross section: oval.
The smallest recorded mature male is 89.2 cm TL; smallest juvenile male 49.2 cm TL; a female found pregnant with both uteri containing an undetermined number of fertilised eggs 135,1 cm TL; one immature female 105.5 cm TL and five mature females between 126.0-145.5 cm TL (Ref. 125648). Ovoviviparous (Ref. 205).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Distinct pairing with embrace (Ref. 205).
Yano, K and S. Tanaka, 1984. Review of the deep sea squaloid shark genus Scymnodon of Japan, with a description of a new species. Jap. J. Ichthyol. 30(4):341-360. (Ref. 31249)
IUCNのレッドリストの状況は (Ref. 130435: Version 2025-1)
Human uses
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (参照
82804): PD
50 = 0.6250 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00380 (0.00164 - 0.00880), b=3.14 (2.95 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
栄養段階 (参照
69278): 4.2 ±0.7 se; based on size and trophs of closest relatives
回復力 (参照
120179): 低い, ４．５年～１４年の倍増期間の最小個体群 (Fec assumed to be <100).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
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