Discovery of a new intertidal trapdoor spider of the genus Idioctis (Araneae: Barychelidae), with a generic range extension to Taiwan

IF 1 3区 农林科学 Q3 ENTOMOLOGY Journal of Arachnology Pub Date : 2023-10-06 DOI:10.1636/joa-s-22-020
Kuang-Ping Yu, Ying-Yuan Lo, Ren-Chung Cheng, Robert J. Raven, Matjaž Kuntner
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Abstract

Most spiders are exclusively terrestrial with only some groups venturing into aquatic habitats, and only a handful of representatives colonizing the marine intertidal zone. Here, we describe a new intertidal trapdoor spider species, Idioctis parilarilao sp. nov., from southern Taiwan and Green Island (Lutao). The original DNA barcode enables species delimitation between different populations from Taiwan and the morphologically closest species, Idioctis xmas, from Christmas Island, Indian Ocean. These analyses reveal that all populations from Taiwan, including Green Island, are conspecific, and are distinct from Idioctis xmas. Given the lack of representation of other species in public databases, our COI gene tree should be seen as preliminary, but it does support the monophyly of the genus Idioctis. As the genus was not previously known from East Asia, our discovery vastly extends the distribution range of Idioctis and the family Barychelidae. Given the tectonic and volcanic specifics of the history of Taiwan and Green Island, and the direction of the known oceanic currents, we provide a preliminary explanation of the biogeographic and diversification history of intertidal spiders in the region.
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潮间带活门蜘蛛一新种的发现(蜘蛛目:活门蜘蛛科),属范围延伸至台湾
大多数蜘蛛完全生活在陆地上,只有一些群体冒险进入水生栖息地,只有少数代表在海洋潮间带定居。本文描述了一种新的潮间带活门蜘蛛,Idioctis parilarilao sp. nov.,分布于台湾南部和绿岛(鹿岛)。原始的DNA条形码可以区分台湾不同种群和印度洋圣诞岛形态最接近的Idioctis xmas物种。分析结果显示,台湾包括绿岛在内的所有种群均为同种,且与圣诞节Idioctis不同。鉴于公共数据库中缺乏其他物种的代表性,我们的COI基因树应该被视为初步的,但它确实支持Idioctis属的单系性。由于该属以前在东亚不为人所知,我们的发现极大地扩展了Idioctis和Barychelidae科的分布范围。结合台湾和绿岛的构造和火山特征,以及已知的洋流方向,初步解释了该地区潮间带蜘蛛的生物地理和多样化历史。
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来源期刊
Journal of Arachnology
Journal of Arachnology 生物-昆虫学
CiteScore
2.20
自引率
10.00%
发文量
34
审稿时长
>12 weeks
期刊介绍: The Journal of Arachnology publishes scientific articles reporting novel and significant observations and data regarding any aspect of the biology of arachnid groups. Articles must be scientifically rigorous and report substantially new information.
期刊最新文献
Negative allometry of orb web size in spiders and the implications for the evolution of giant webs Discovery of a new intertidal trapdoor spider of the genus Idioctis (Araneae: Barychelidae), with a generic range extension to Taiwan Three new species of the giant vinegaroon genus Mastigoproctus (Thelyphonida: Thelyphonidae) from Mexico Meta menardi and M. bourneti (Araneae: Tetragnathidae) segregate along the altitudinal gradient of Mount Etna (Sicily, S–Italy) Patterns of the introduction, spread, and impact of the brown widow spider, Latrodectus geometricus (Araneae: Theridiidae), in the Americas
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