分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii
板鰓亞綱 (鯊魚與魟魚) (sharks and rays) >
Rhinopristiformes (Shovelnose rays)
鰩目 (Shovelnose rays) >
Rhinobatidae (Guitarfishes)
琵琶鱝科 (Guitarfishes)
Etymology: Rhinobatos: Greek, rhinos = nose + Greek, batis, -idos = a ray (Raja sp.) (Ref. 45335); nudidorsalis: Name from Latin 'nudus' meaning bare or naked and 'dorsum' for back, referring to its smooth, denticle-free upper surface..
More on authors: Last, Compagno & Nakaya.
Environment: milieu / climate zone / depth range / distribution range
生態學
海洋 居於水底的; 深度上下限 ? - 125 m (Ref. 55722). 熱帶
Central Indian Ocean: Mascarene Ridge.
印度洋中部: 瑪斯科林海脊。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 50.1 cm TL 雄魚/尚未辨別雌雄; (Ref. 55722)
簡短描述
型態特徵 | 形態測量圖
This species is distinguished by the following characters: no thorns on upper surface of the disc, with tail and unpaired fins almost entirely naked; a small, elongate to oval-shaped denticle patch across a naked upper caudal peduncle and upper caudal-fin lobe; a wedge-shaped disc; moderately large orbit, exceeding 4% total length (TL); oblique nostrils, length 1.7 times internarial distance; anterior nasal flaps penetrating well into internarial space, but not almost united; posterior nasal flaps broad; ridges of rostral cartilages well separated dorsally and almost parallel; prebranchial sensory pore patch narrow, extending to first gill slit; postscapular sensory canal long with lateral pores, not grooved, extending almost to pectoral-fin insertions; low dorsal fins; pelvic-fin inner margin distinctly longer than its base; interdorsal distance less than 2.5 times first dorsal-fin base; 2 spiracular folds, outer is much larger than the inner one; caudal fin small with dorsal margin about 1.8 times preventral margin; 172 total vertebral centra; dorsal disc plain colored (Ref. 55722).
這種被藉著下列的特徵區別: 沒有在體盤, 尾部與不成對的鰭上表皮上的刺幾乎完全裸露; 小,越過一個裸露的上尾部的梗與上尾部-鰭葉對橢圓形的細齒小區塊延長; 一個楔形的體盤; 普通大的眼窩, 超過 4% 全長 (TL); 斜的鼻孔, 倍 internarial 距離的長度 1.7; 前鼻瓣進入鼻孔間隙之內相當深入, 但是不是幾乎聯合; 後鼻蓋寬的; 嘴軟骨組織的脊背面分得很開與幾乎平行; 前鰓感覺小孔小區塊狹窄的, 第一個延伸至鰓縫; postscapular 知覺管長的，側面的孔, 沒有溝槽,幾乎延伸到胸鰭嵌入; 低的背鰭; 腹鰭內緣明顯長度超過它的基底; 間背片距離少於 2.5 倍第一背鰭鰭基底; 2 噴水孔摺層, 外部的是比一個內部的大很多; 尾鰭小且有上緣大約 1.8 倍 preventral 邊緣; 172 總計椎骨的中心; 背部的體盤單色的.(參考文獻 55722)
Offshore on insular shelves of the Central Indian Ocean, distribution probably restricted (Ref. 114953). Maximum size is actually unknown, presumably a small- to moderate-size species given that the half-meter holotype is sexually mature (Ref. 55722). Biology is unknown, more specimens needed (Ref. 114953).
最大體長實際上未知, 可能給一半-公尺 holotype 是性成熟的一個小到中等-大小種.(參考文獻, 55722)
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
印度洋中部: 瑪斯科林海脊。
Last, P.R., L.J.V. Compagno and K. Nakaya, 2004. Rhinobatos nudidorsalis, a new species of shovelnose ray (Batoidea: Rhinobatidae) from the Mascarene Ridge, central Indian Ocean. Ichthyol. Res. 51:153-158. (Ref. 55722)
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