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)
(Skates and rays) > Arhynchobatidae
Etymology: Bathyraja: Greek, bathys = deep + Latin, raja, -ae = a ray (Raja sp) (Ref. 45335).
Environment: milieu / climate zone / depth range / distribution range
; 海 底生の; 深さの範囲 0 - 1685 m (Ref. 123566), usually 126 - 810 m (Ref. 123566). Deep-water
Southern Ocean: widespread, circumantarctic: Atlantic sector (off the South Shetland, Brabant, and Biscoe Islands to the South-East Weddell Sea); Pacific (Ross Sea); Indian (from Prydz Bay).
サイズ / 重さ / 年齢
Maturity: Lm ?  range ? - ? cm
Max length : 61.0 cm TL オス/雌雄の選別がない; (Ref. 123566); 53.5 cm TL (female)
形態学 | 形態計測学
This species is characterized by the following: usually completely medium to dark grayish pigmented mouth cavity, often dark underside of the nasal curtain from very small juvenile stages onwards; differs from most congeners in Antarctic and Subantarctic waters in the absence of thorns on the dorsal disc. It is further distinguished by the following characters: disc
evenly inverse heart-shaped (the disc margins distinctly undulated in adult males, but not or slightly undulated in others), with broadly rounded outer corners and with body length to mid-cloaca shorter than or equal to tail length from mid-cloaca; preorbital snout length 8.1-16.2% TL (depending on ontogenetic stage) and distance between first gill slits 14.2-15.9% TL; orbits are moderately large, horizontal diameter 1.3-1.8 times interorbital width; upper side of the disc and tail entirely rough, prickly with dermal denticles while the underside is smooth; except for alar thorns of mature males, no thorns on disc but only a median row of 19-30 small thorns along tail to first dorsal fin, the thorns become smaller and more widely spaced posteriorly in subadults and adults and are generally wider spaced in large juveniles to adults as compared with small juveniles; bases of low, more or less equal-sized dorsal fins confluent or with short interspace; postdorsal tail section very short, 1.7-5.2% TL, with low epichordal caudal lobe which is confluent with second dorsal fin; opened clasper tip shows all components typical for Bathyraja species, of which most apparent a long and deep pseudosiphon (ps) along outer edge of dorsal lobe, as well as a massive projection (pj) over entire length of the inner ventral lobe; clasper terminal skeleton with distal processes of dorsal marginal cartilage (forming external pseudorhipidion) and ventral marginal cartilage (forming external projection), 3 dorsal terminal cartilages (with dt1 very large and encapsulating terminal skeleton), ventral terminal, and one accessory terminal cartilage; apparent sexual dimorphism in scapulocoracoid, with post-mesocondyle length longer in females than in males. Colouration: dorsal ground color plain dark to medium grayish-brown, often with mostly indistinct scattered pale and dusky spots on disc, the posterior pelvic lobes and on sides of tail, occasionally with transverse white pseudoocellus stripe on inner posterior pectorals; ventral or underside mostly plain white or pale, often with gray marked cloaca and gray spots on belly to gill region, occasionally gray spotted posterior pectoral margins, origin and sides of tail, or tail partly dark; mouth cavity and underside of nasal curtain at least partly, usually completely pigmented medium to dark grayish from very small juvenile stages onwards (Ref. 123566).
Individuals collected deeper than 810 m indicate that the species possibly occurs in greater depths in the Pacific sector, but may also be the result of differing fishery efforts in the respective depths. Most specimens caught deeper than 810 m were adults but were also recorded from shallower depths elsewhere and juveniles in turn were also recorded deeper than 810 m and even below 1000 m (Ref. 123566).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
Stehmann, M.F., S. Weigmann and G.J. Naylor, 2021. First complete description of the dark-mouth skate Raja arctowskii Dollo, 1904 from Antarctic waters, assigned to the genus Bathyraja (Elasmobranchii, Rajiformes, Arhynchobatidae). Mar. Biodiv. 51(1):1-27. (Ref. 123566)
CITES (Ref. 123416)
協力者画像Stamps, Coins Misc.音シガテラ（食中毒の名前）速度泳ぐ 型式カマOtoliths脳視覚
Estimates based on models
Phylogenetic diversity index (Ref. 82805
= No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
栄養段階 (Ref. 69278
): 3.9 ±0.7 se; based on size and trophs of closest relatives
回復力 (Ref. 120179
): 低い, ４．５年～１４年の倍増期間の最小個体群 (Preliminary K or Fecundity.).
弱み (Ref. 59153
): Moderate to high vulnerability (47 of 100) .