Stenalpheops anacanthus, new genus, new species (Crustacea, Decapoda, Alpheidae) from the Seto Inland Sea and the Sea of Ariake, South Japan
Stenalpheops anacanthus, new genus, new species (Crustacea, Decapoda, Alpheidae) from the Seto Inland Sea and the Sea of Ariake, South Japan
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Stenalpheops anacanthus，来自日本南部濑户内海和有明海的新属、新种（甲壳类、十足目、海藻科）
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发表时间：
1997
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通讯作者：
Y. Miya
中科院分区：
文献类型：
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作者：
Y. Miya
从日本南部濑户内海和有明海采集的标本中描述和说明了一种新属，新种。它的亲缘关系最密切的属，Potamalpheops Powell, 1979，讨论。其区别在于：具圆齿的板片沿尿足外足动物的导管全长存在；缺眶齿；眼柄具前内侧突起；在第1触角节上没有腹齿；触角基部的硬骨无武装；存在肛门结节；在近半上位于外侧的端部的两对背刺；具6个外稃和4个刚毛枝；在第一准足目动物的掌面内侧有成排的毛，在其他分类单元中未见报道。此外，在两个较大的雄性标本（全型（CL 6.6mm）和一个准型（CL 6.4mm））中，在尾足外足的远端边缘发现了对称发育的节段性阑尾，没有肌肉组织。这当然是不寻常和独特的，但可以提供证据表明，尾足动物的“外足远端节”也“有时是多节的”（McLaughlin, 1982: 202）。CL：包括喙部在内的甲壳长度。在建立一个新的属，包括以下日本海洋形式之前，我犹豫了很多年，它与Potamalpheops Powell（1979）非常密切相关，来自西非的淡水和咸淡水，然后来自墨西哥的一个淡水洞穴（Hobbs, 1983），最近来自地址：长崎大学文学院生物实验室，日本长崎852（电子邮件：miya@net.nagasaki-u.ac.jp）。
Stenalpheops anacanthus, new genus, new species, is described and illustrated from specimens collected from the Seto Inland Sea and the Sea of Ariake, South Japan. Its affinities with the most closely related genus, Potamalpheops Powell, 1979, are discussed. The distinctions from Potamalpheops are: crenate lamella present along the full length of diaeresis of uropodal exopod; orbital teeth lacking; eyestalk with anteromedial protuberance; without ventral tooth on 1st antennular segment; sclerite at the base of antennule unarmed; anal tubercles present; two pairs of dorsal spines of telson situated laterally on proximal half; with 6 epipods and 4 setobranchs; and with rows of grooming setae on medial face of merus of 1st pereopod, which have not been reported in any other taxon. In addition, the symmetrical development of segmented appendix, without musculature, at the distal margin of uropodal exopods is found in two larger male specimens, the holotype (CL 6.6mm) and one paratype (CL 6.4mm). This is certainly unusual and unique, but can present an evidence to show "the distal segment of exopod" of uropods also "sometimes being multiarticulate" (McLaughlin, 1982: 202). CL: carapace length including rostrum. I have hesitated for many years before establishing a new genus to include the following Japanese marine form, which is very closely related to Potamalpheops Powell, 1979, from fresh and brackish waters in west Africa, then from a fresh water cave in Mexico (Hobbs, 1983) and recently from Address: Biological Laboratory, Faculty of Liberal Arts, Nagasaki University, Nagasaki 852, Japan, (e-mail:miya@net.nagasaki-u.ac.jp)