ইলাসমোব্রাঙ্কি (হাঙ্গর এবং রে) (sharks and rays) >
Rajiformes (Skates and rays) >
Gurgesiellidae (Pygmy skates)
Etymology: Cruriraja: Latin, crur, cruris = pertaining to a leg + Latin, raja = a ray (Raja sp) (Ref. 45335); hulleyi: Named for P.A. ‘‘Butch’’ Hulley, for his pioneering research on southern African skates.
Eponymy: Dr Percy Alexander ‘Butch’ Hulley (d: 1941) is a South African zoologist and ichthyologist. [...] (Ref. 128868), visit book page.
পরিবেশ: পরিবেশ / জলবায়ু অঞ্চল / গভীরতার পরিসীমা / বিতরণ পরিসীমা
বাস্তুসংস্থান
সামুদ্রিক সমুদতলে ভাসমান বেনথোপেলাজিক; গভীরতার পরিসীমা 39 - 545 m (Ref. 85323), usually 200 - 500 m (Ref. 85323). Subtropical
Southeast Atlantic: Lüderitz, Namibia to Algoa (and possibly East London) on the Eastern Cape coast of South Africa.
আকৃতি / ওজন / বয়স
পরিপক্কতা : Lm ? range ? - ? cm
Max length : 58.0 cm TL পুরুষ/ লিঙ্গ অনিধর্ারিত ; (Ref. 85323); 59.4 cm TL (female)
সংক্ষিপ্ত বিবরণ
সনাক্তকারী নির্দেশক | বহিঃ অঙ্গ সংস্থান | মরফোমেট্রিক্স
This species is distinct from its congeners in having the following characters: spatulate distal ends of the anterior pelvic lobes (wider tip in C. cadenati, tapering in others); dorsal mid-disk and tail with continuous semiparallel rows of thorns in adults (no thorns on mid-disk in C. rugosa, present on midline in others); claspers with small, flattened process (boss) on accessory terminal 2 cartilage and blind-ended sac with posterior opening at the distal end of the clasper (sentina), both unique within genus to C. hulleyi; interdorsal thorns 6 (none in C. durbanensis, 2 in C. parcomaculata, 4 in C. poeyi, 1 in C. rugosa, many in C. atlantis). This species is further distinguished from its congeners by the following set of characters: interdorsal distance greater than half, and not exceeding, dorsal-fin base length (vs. at least 1.5 times dorsal-fin base length in C. atlantis, half or less dorsal-fin base length in C. parcomaculata); outer lateral margin of clasper dorsal marginal cartilage elongated and bluntly rounded (truncate in C. rugosa); proximal margin of dorsal terminal I cartilage forms a point (a series of points in C. rugosa); distal point (eperon) of ventral terminal cartilage relatively narrow and claw-like (bifurcate in C. parcomaculata, expanded in C. rugosa); ventral surface of clasper without dermal denticles (present in C. parcomaculata) (Ref. .85323).
Body shape (shape guide): other.
Reported to be a moderately common species of the outer shelf and upper continental slope, 39-545 m deep, but most common between 200 and 500 depth. Larger individuals tend to occur on the west coast of southern Africa, while those on the south coast are slightly smaller. The egg case was described to be small, vase-like, measuring less than 50 mm long excluding horns, surface coarsely striated, and with very narrow lateral keels, <1% of maximum egg case width; its posterior horns are approximately 45% longer than the anterior horns, tapering to thin tips, curving inwards and with fine attachment fibers; the anterior horns are hook-shaped, with acute tips (Ref. 85323).
জীবনচক্র এবং প্রজনন আচরণ
পরিপক্কতা | প্রজনন | ডিম ছাড়া | ডিমসমূহ | ডিম্বধারন ক্ষমতা | শুককীট
Aschliman, N.C., D.A. Ebert and L.J.V. Compagno, 2010. A new legskate (Rajoidei: Genus Cruriraja) from Southern Africa. Copeia 2010(3):364-372. (Ref. 85323)
আইইউসিএন রেড লিস্টের অবস্থা (Ref. 130435: Version 2025-2 (Global))
মানুষের জন্য হুমকি
Harmless
মানুষের ব্যবহার
হাতিয়ার
বিশেষ প্রতিবেদন
XML ডাউনলোড করুন
ইন্টারনেট সুত্র
মডেলের উপর ভিত্তি করে অনুমান
পছন্দের তাপমাত্রা (সূত্র
123201): 6.7 - 14, mean 9.5 °C (based on 54 cells).
ফাইলোজেনেটিক বৈচিত্র্য সূচক (সূত্র
82804): PD
50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00661 (0.00227 - 0.01925), b=2.95 (2.71 - 3.19), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
ট্রফিক পর্যায়ে (সূত্র
69278): 3.9 ±0.6 se; based on size and trophs of closest relatives
মাছ ধরার ঝুঁকিপূর্ণতা (Ref.
59153): Moderate vulnerability (44 of 100).
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