A New Fresh-water Prawn of the Genus Macrobrachium (Crustacea,Decapoda,Caridea) from Iriomote Island of the Ryukyus
A New Fresh-water Prawn of the Genus Macrobrachium (Crustacea,Decapoda,Caridea) from Iriomote Island of the Ryukyus
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琉球西表岛沼虾属淡水虾新品种（甲壳类、十足目、虾类）
DOI：
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发表时间：
1973
期刊：
影响因子：
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通讯作者：
K. Baba
中科院分区：
文献类型：
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作者：
T. Fujino;K. Baba
在琉球岛岛发现淡水对虾一新种，定名为shokitai Macrobrachiuni sp. 11 .该新种与formosense Bate Macrobrachiuni有密切的亲缘关系，与前者的不同之处是具有较少的下吻齿，眶角呈圆形凸起，第二知觉足类螯表面有许多小瘤等。本种局限于两条河流上游的淡水中，特点是卵大而卵少。大臂腕鱼属包括许多不同的种类，主要生活在咸淡水和淡水中。从琉球群岛的冲绳群和八山群中，迄今为止Parisi (1919), Ohshima（1935）和Kubo（1940, 1941）记录了该属的7种：Macrobrachiuni equidens (Dana)， M. formosense Bate， M. grandimamis (Randall)， M. japonicum (de Haan)， M. lar (fabicius)， M. latimanus （von Martens）和M. gracilirostre （Miers）。S. Shokita先生最近对八山组的淡水虾和对虾进行了生态调查，并获得了该属一种未被描述的物种的许多标本，这些标本经过检查并被描述为M. shokitai sp. 11 .正如Shokita的下一份报告（1973）所述，该物种出现在八山组最大的Iriomote岛的浦内河和Mera河的上游。它以携带大而少的卵和完全抑制幼虫发育而闻名。本文仅提供新对虾的形态描述，读者参考
A new species of the fresh-water prawn was found at Ir iomote Island of the Ryukyus, and is here described as Macrobrachiuni shokitai sp. nov. The new species is closely related to Macrobrachiuni formosense Bate, f r om which it differs in having a smaller number of lower rostral teeth, the orbital angle produced as a round convexity, and many tubercles on the surface of the second pereiopod chela, etc. This species is confined to fresh-water of the upper reaches of two rivers, and is characterized by bearing large and few eggs. The genus Macrobrachiuni Bate of the Palaemonidae includes many varied species inhabiting chiefly brackish and fresh waters. From the Okinawa and the Yaeyama Groups of the Ryukyus, seven species of this genus have so far been recorded by Parisi (1919), Ohshima (1935) and Kubo (1940, 1941): Macrobrachiuni equidens (Dana), M. formosense Bate, M. grandimamis (Randall), M. japonicum (de Haan), M. lar (Fabricius), M. latimanus (von Martens), and M. gracilirostre (Miers). Mr. S. Shokita has recently carried out ecological investigations of fresh-water shrimps and prawns in the Yaeyama Group, and has secured a number of specimens of an undescribed species of this genus, which were examined and are described here as M. shokitai sp. nov. As will be seen in the next report by Shokita (1973), this species occurs in the upper parts of both the Urauchi and the Mera Rivers in Iriomote Island, the largest of the Yaeyama Group, and is very remarkable for carrying large and few ova and for having a completely suppressed larval development. This paper provides only the morphological description of the new prawn, and the reader is referred to the