We reviewed and compared the occurrence and biogeographic origins of three arthropod groups, darkling beetles (Coleoptera, Tenebrionidae), spiders (Araneae) and butterflies (Papilionoidea) on the Socotra archipelago (Yemen). More than half of the darkling beetles (80.3%) and spiders (51.5%) are endemic to the Socotra archipelago, in contrast with only 5 species (18.5%) of butterflies. The number of non-endemic taxa is higher among those distributed widely in the Afro-Oriental region, less of taxa from Afro-Arabian or African origin. These species colonised the Archipelago by natural means, but we document also introduction through human activity. The exact distribution and evolutionary patterns still need thorough research (e.g. molecular, phylogenetic, and phylogeographic analyses).

中文翻译：

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索科特拉群岛（也门）三个节肢动物群的生物地理起源比较

我们审查并比较了三足节肢动物群的发生和生物地理起源，它们是索科特拉群岛（也门）上的黑甲虫（鞘翅目，天蛾科），蜘蛛（Araneae）和蝴蝶（Papilionoidea）。超过一半的黑甲虫（80.3％）和蜘蛛（51.5％）是索科特拉群岛的特有种，而只有5种（18.5％）的蝴蝶是相反的。在非洲东部地区广泛分布的非地方性分类单元中，非地方性分类单元的数量较多，而来自非洲裔或非洲裔的分类单元则较少。这些物种是通过自然手段在群岛上殖民的，但我们也记录了通过人类活动引入的情况。确切的分布和进化模式仍然需要深入研究（例如分子，系统发育和系统地理分析）。