On three new species of non-marine ostracods (Crustacea: Ostracoda) from Northeast Thailand.
On three new species of non-marine ostracods (Crustacea: Ostracoda) from Northeast Thailand.
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DOI：
10.11646/zootaxa.3914.3.3
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发表时间：
2015-01
期刊：
影响因子：
0.9
通讯作者：
Sukonthip Savatenalinton
中科院分区：
文献类型：
--
作者：
Sukonthip Savatenalinton
本文记述了我国陆相介形类三新种--马氏介形类Strandesia martensi n.sp.、海南介形类Strandesia pholputeni n.sp.和oncocypris rostrata n.sp.，在这里被描述，来自泰国东北部。马氏链霉菌Strandesia martensi n.sp.与Perakis Strandesia Victor&Fernando，1981和Stradesia sanoamuangae Savatenalinton&Marten，2010相似。它与这两个种的区别在于两个瓣膜上都有一个大的背部驼峰，大的前部重叠，瓣膜的一般形状，瓣膜表面的纹饰和尾侧支近端的明显长的刚毛。并对其主要鉴别特征进行了研究。右瓣后端受压，左瓣前部与右瓣重叠，右瓣后部与左瓣重叠。这导致前肢和后肢不等长，这在背侧面上可以清楚地看到。罗氏钉螺(Oncocypris rostrata n.sp.)是该属在泰国的第一个记录。在背侧的喙状前肢、内侧的瓣膜结构、由大脓泡和大凹陷组成的瓣膜纹饰以及雄性生殖器官的形态上都有明显的不同，特别是右手掌的第一段有一长的顶棘，远端缘向第二段有一个大的突起。记述了钉螺的形态、脉络和种类检索表。
Three new species of non-marine ostracods, Strandesia martensi n. sp., Strandesia pholpunthini n. sp. and Oncocypris rostrata n. sp., are here described from the Northeastern part of Thailand. Strandesia martensi n. sp. is similar to Strandesia perakensis Victor & Fernando, 1981 and to Strandesia sanoamuangae Savatenalinton & Martens, 2010. It can be distinguished from these two species by the presence of a large dorsal hump on both valves, large anterior overlapping, the general shape of valve, the ornamentation of valve surface and the markedly long proximal seta of caudal ramus. The main distinguishing characters of Strandesia pholpunthini n. sp. are the compression on the right valve at the posterior extremity and the fact that left valve overlaps right valve anteriorly, while right valve overlaps left valve posteriorly. This results in unequal anterior and posterior extremities, which can be seen clearly in the dorsal view. Oncocypris rostrata n. sp. is the first record of this genus in Thailand. It obviously differs from others in the beak-like anterior extremity in dorsal view, the valve structure in interior view, the valve ornamentation comprising of large pustules and large pits and the morphology of male reproductive organ, especially the first segment of the right prehensile-palp bearing a long apical spine and a large protrusion on the distal margin toward the second segment. A note on morphology, chorology and a key to the species of Oncocypris are given.