Spiders from limestone caves of Akiyoshi-dai plateau, Yamaguchi Prefecture, Japan (II)
Spiders from limestone caves of Akiyoshi-dai plateau, Yamaguchi Prefecture, Japan (II)
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日本山口县秋吉台高原石灰岩洞穴中的蜘蛛（二）
DOI：
10.2476/asjaa.27.specialnumber_1
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发表时间：
1977
影响因子：
--
通讯作者：
T. Yaginuma
中科院分区：
文献类型：
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作者：
T. Yaginuma
这是我上一篇论文的延续。（1936）在Akiyoshi石灰岩地区的洞穴蜘蛛。目前在该地区洞穴中共记录到57种，其中32种是后来调查发现的。其中，两个是新的科学，一个隙蛛和一个亚种的Nesticus akiyoshiensis。只有六种蜘蛛，占已知蜘蛛的10.7%，似乎是秋吉洞特有的。它们是：秋吉细蛛（Leptoneta akiyoshiensis）、仓本细蛛（Leptoneta kuramotoi）、上野细蛛（Leptoneta uenoi）、秋吉巢蛛（Nesticus akiyoshiensis）（亚种. ofuku）、仓本Cybaeus kuramotoi和仓本C.冈藤井。19种蜘蛛中的大多数都是在其他地区的洞穴中常见的。有趣的是，蜘蛛对秋吉石灰岩中的旧洞穴的适应程度与富士熔岩中的新洞穴大致相当。在这两个地区，穴居物种的数量相对较少，个别洞穴的特有性低。这不能仅仅归因于巧合。前者表明，适应的程度并不仅仅取决于洞穴的历史。后者似乎表明，洞穴之间的隔离是不完全的，在我以前的一篇论文中，我说，没有分化的洞穴蜘蛛可能发生在Akiyoshi石灰岩地区。然而，后来的研究表明，至少在Nesticus akiyoshiensis，确定的形态差异可以识别之间的种群的东部高原和西部高原，这是彼此分开的谷江东。因此，在本文中，我将该物种分为两个亚种。类似的现象已经在Trechid甲虫Trechiama pluto中发现。
This is a continuation of my previous paper. (1936) on the cave spiders of the Akiyoshi limestone area. Total 57 species are now recorded from the caves of this area, and 32 of them have been found by later investigations. Of these, two are new to science, a Coelotes and a subspecies of Nesticus akiyoshiensis. Only six species, or 10.7% of the known spiders, seem to be peculiar to Akiyoshi caves. They are: Leptoneta akiyoshiensis, Leptoneta kuramotoi, Leptoneta uenoi, Nesticus akiyoshiensis (with subsp. ofuku), Cybaeus kuramotoi and C. okafujii. Most of the nineteen species that are regarded as troglophilous and scotophilous forms are common to caves in other areas.It is interesting that in spiders, the degree of adaptation to old caves in the Akiyoshi limestones is roughly comparable with that to new caves in the Fuji lavas. In both the areas, troglobiontic species are relatively few in number and the endemicity to individual caves is low. This cannot be attributed to a mere coincidence. The former suggests that the degree of adaptation is not dependent solely on the history of caves. The latter seems to indicate that the isolation between caves is not complete in the areas under consideration.In one of my previous papers, I stated that no differentitaion of cave spiders may have occurred within the Akiyoshi limestone area. However, later investigations show that at least in Nesticus akiyoshiensis, decided morphological difference can be recognized between the populations of the eastern plateau and those of the western one, which are separated from each other by the valley of the River Koto. In this paper, therefore, I divided the species into two subspecies. A similar phenomenon has already been known in the trechid beetle, Trechiama pluto.