分類 / Names
共通名の | 類義語 | Catalog of Fishes(部類, 種) | ITIS | CoL | WoRMS | Cloffa
板鰓亜鋼(サメとエイ類) (sharks and rays) >
Rajiformes (Skates and rays) >
Arhynchobatidae (Softnose skates)
Etymology: sexoculata: Named for the color pattern of the species, the six white blotches (ocelli) on the dorsal disc..
Environment: milieu / climate zone / depth range / distribution range
生態学
海 底生の; 深さの範囲 ? - 150 m (Ref. 123274). Temperate
Northwest Pacific: Simushir Island, Kuril Islands.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 35.2 cm TL オス/雌雄の選別がない; (Ref. 123274); 28.6 cm TL (female)
簡単な記述
検索表 | 形態学 | 形態計測学
This medium-sized species (ca. max. size 80.0 cm TL, 55.0 cm DW) is distinguished by the following set of characters: dorsal ground color is reddish-brown or greenish-brown, with three pairs of white blotches on disc located beside eyes, and on shoulders and posterior half of disc; lateral margin of tail with 4 or 5 pairs of white blotches located at the tail origin, midpoint, D1 origin, and on inter-dorsal space; ventral surface is almost entirely white; dark blotch around cloaca, dark bands along mid ventral line of tail; dorsal surface of disc with a single scapular thorn, 3-4 nuchal thorns; tail with 20-24 regularly arranged thorns; the median row of thorns discontinuous, no mid-dorsal thorns; orbital thornlets along medial rim of orbit; dorsal surface of disc and tail with fine prickles; prickle band on mid-disc extending along sides of tail; prickles on pectoral fin base relatively sparse; ventral surface is uniformly smooth; disc width 63.1-65.6% TL, length 50.6-53.5% TL; anterior projection (snout to maximum width) 29.7-32.2% TL; head length (dorsal aspect) 18.9-20.6% TL; snout broad and moderately short, preoral length 11.1-14.1% TL, supported by slender, flexible unsegmented cartilage; snout angle 103-119º; eyes rather large with eye diameter 0.22-0.24 times head length, 1.00-1.11 times between orbits; tail relatively long (but shorter than disc width), length 51.5-54.1% TL and 0.79-0.86 times DW, width at first dorsal fin origin 3..8-4.2% tail length; predorsal caudal vertebrae 86-93 (Ref. 123274).
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 幼生
Misawa, R., A.M. Orlov, S.Y. Orlova, I.I. Gordeev, H. Ishihara, T. Hamatsu, Y. Ueda, K. Fujiwara, H. Endo and Y. Kai, 2020. Bathyraja (Arctoraja) sexoculata sp. nov., a new softnose skate (Rajiformes: Arhynchobatidae) from Simushir Island, Kuril Islands (western North Pacific), with special reference to geographic variations in Bathyraja (Arctoraja) smirnovi. Zootaxa 4861(4):515-543. (Ref. 123274)
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 (Ref.
82804): PD
50 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
栄養段階 (Ref.
69278): 3.7 ±0.6 se; based on size and trophs of closest relatives
回復力 (Ref.
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 to moderate vulnerability (25 of 100).
