Too early for the ferry: The biogeographic history of the Assamiidae of southeast Asia (Chelicerata: Opiliones, Laniatores)
Too early for the ferry: The biogeographic history of the Assamiidae of southeast Asia (Chelicerata: Opiliones, Laniatores)
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DOI：
10.1016/j.ympev.2022.107647
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发表时间：
2022-10-25
影响因子：
4.1
通讯作者：
Sharma，Prashant P.
中科院分区：
文献类型：
--
作者：
Palmieri，Luciano;Giribet，Gonzalo;Sharma，Prashant P.
由于其古老、分散能力差、对生物地理地体的保真度高，已被认为是研究历史生物地理学的丰富模型组的来源。最不为人所知的收割者群体之一是古热带阿萨米科，它是欧普利奥科中种类较多的一个科。由于错综复杂的分类学，建立的属和亚科的界限很差，以及缺乏该组的分类检索表，很少有人努力破译这一蜘蛛纲谱系内的关系。无论是该家族的单系，还是它在收割机系统发育中的确切位置，都还没有确定。在这里，我们使用一个十个位点的Sanger数据集来评估Assamiidae的内部系统发育，对十个标记中的五个可能归因于这个家族的关键谱系进行抽样。我们的分析发现，该科是一个单系群，与主要为非洲热带的金龟科和东南亚的贝罗尼西科为一个支系。蝗科的内部关系不利于亚科的系统有效性，生物地理学比现有的更高水平的分类反映了更好的系统发育结构。为了评估亚洲类人猿是否通过漂流在印度次大陆上占领了印度-太平洋地体，我们进行了发散测年来推断该家族的年龄。我们的结果表明，印度-太平洋分支是古老的，起源于白垩纪之前，因此早于古热带分类群常见的替代机制。
Opiliones (harvestmen) have come to be regarded as an abundant source of model groups for study of historical biogeography, due to their ancient age, poor dispersal capability, and high fidelity to biogeographic terranes. One of the least understood harvestman groups is the Paleotropical Assamiidae, one of the more diverse families of Opiliones. Due to a labyrinthine taxonomy, poorly established generic and subfamilial boundaries, and the lack of taxonomic keys for the group, few efforts have been undertaken to decipher relationships within this arachnid lineage. Neither the monophyly of the family, nor its exact placement in the harvestman phylogeny, have been established. Here, we assessed the internal phylogeny of Assamiidae using a ten-locus Sanger dataset, sampling key lineages putatively ascribed to this family for five of the ten markers. Our analyses recovered Assamiidae as a monophyletic group, in a clade with the primarily Afrotropical Pyramidopidae and the southeast Asian Beloniscidae. Internal relationships of assamiids disfavored the systematic validity of subfamilies, with biogeography reflecting much better phylogenetic structure than the existing higher-level taxonomy. To assess whether the Asian assamiids came to occupy Indo-Pacific terranes via rafting on the Indian subcontinent, we performed divergence dating to infer the age of the family. Our results show that Indo-Pacific clades are ancient, originating well before the Cretaceous and therefore predate a vicariant mechanism commonly encountered for Paleotropical taxa.