Santamaria Carlos A
Biology Faculty, College of Science and Mathematics, University of South Florida, Sarasota, FL, United States of America.
Department of Biological Sciences, Sam Houston State University, Huntsville, TX, United States of America.
PeerJ. 2019 Aug 15;7:e7531. doi: 10.7717/peerj.7531. eCollection 2019.
Past phylogeographic work has shown a coastal isopod species endemic to the Hawaiian Islands, to be a paraphyletic complex of several highly genetically divergent yet morphologically cryptic lineages. Despite the need for a taxonomic revision of this species, the lack of morphological differentiation has proven an impediment to formally describe new species in the region. Molecular characters and species delimitation approaches have been successfully used to formally describe cryptic species in other crustacean taxa, suggesting they may aid taxonomic revisions of . Herein, various distance- and tree-based molecular species delimitation approaches are applied on a concatenated dataset comprised of both mitochondrial and nuclear gene sequences of and , a terrestrial species endemic to the Hawaiian archipelago. Results of these analyses informed a taxonomic revision leading to the redescription of and the description of seven new cryptic species on the basis of molecular characters: , , , , , , and . These coastal species from the Hawaiian archipelago appear to be largely limited to single islands, where they appear largely constrained to volcanic rift zones suggesting allopatric events at local scales may drive diversification for poorly dispersing organisms in the Hawaiian coastlines. Additional work remains needed to fully assess the role of said events; however, the description of these novel species underscore their potential to aid in studies of local diversification of marine organisms in Hawai'i. Lastly, this represents the first application of molecular taxonomic approaches to formally describe genetic lineages found in isopods as species, underscoring the promise these methods hold to taxonomic revisions in other species in the genus shown to harbor cryptic genetic lineages.
过去的系统地理学研究表明，夏威夷群岛特有的一种沿海等足类物种是几个遗传上高度分化但形态上难以区分的谱系组成的并系复合体。尽管需要对该物种进行分类修订，但形态上缺乏分化已被证明是正式描述该地区新物种的一个障碍。分子特征和物种界定方法已成功用于正式描述其他甲壳类分类群中的隐性物种，这表明它们可能有助于进行分类修订。在此，我们将各种基于距离和树的分子物种界定方法应用于一个串联数据集，该数据集由夏威夷群岛特有的一种陆生物种的线粒体和核基因序列组成。这些分析结果为分类修订提供了依据，从而重新描述了该物种，并基于分子特征描述了七个新的隐性物种：[物种名称1]、[物种名称2]、[物种名称3]、[物种名称4]、[物种名称5]、[物种名称6]和[物种名称7]。这些来自夏威夷群岛的沿海等足类物种似乎主要局限于单个岛屿，在这些岛屿上它们似乎主要局限于火山裂谷带，这表明局部尺度上的异域事件可能推动夏威夷海岸线扩散能力差的生物的多样化。仍需要更多工作来全面评估上述事件的作用；然而，这些新物种的描述突出了它们在帮助研究夏威夷海洋生物局部多样化方面的潜力。最后，这代表了首次应用分子分类方法将等足类动物中发现的遗传谱系正式描述为物种，强调了这些方法在对该属中显示存在隐性遗传谱系的其他物种进行分类修订方面的前景。
