ABSTRACT Distribution, nymphal habitat and genetic structure of the New Zealand mayfly Isothraulus abditus were investigated to improve our understanding of its ecology and conservation status. A description of the undescribed subimaginal stage is also provided. Isothraulus abditus has now been recorded from 55 North Island streams, 47 being new to published literature. Its distribution currently extends from Mangonui in Northland to Taumatatahi near Whanganui. Nymphs live in forested stream pools and backwaters containing organic detritus. Genetic structure of six populations was assessed using the mitochondrial cytochrome c oxidase subunit I (COI) gene. Thirty-six haplotypes were identified from 123 individuals, and a maximum uncorrected genetic distance of 1.8% indicated that specimens belong to a single species. However, those within Northland showed some genetic differentiation. Restricted habitat, sparse distribution and some genetic differentiation of I. abditus suggest its conservation status should be classified as ‘At Risk’. LSID: urn:lsid:zoobank.org:pub:75C386BC-C0A5-4627-AE4B-8C5D749D53BA

中文翻译：

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新西兰蜉蝣 Isothraulus abditus（昆虫纲：蜉蝣目）的分布、若虫栖息地、遗传结构和保护及其子成虫描述

摘要 对新西兰蜉蝣Isothraulus abditus 的分布、若虫栖息地和遗传结构进行了调查，以提高我们对其生态和保护状况的了解。还提供了未描述的 subimaginal 阶段的描述。Isothraulus abditus 现在已经从 55 条北岛溪流中记录到，其中 47 条是已发表文献中的新记录。它的分布目前从北地的 Mangonui 延伸到 Whanganui 附近的 Taumatatahi。若虫生活在森林覆盖的溪流池和含有有机碎屑的死水中。使用线粒体细胞色素 c 氧化酶亚基 I (COI) 基因评估了六个种群的遗传结构。从 123 个个体中鉴定出 36 个单倍型，最大未校正遗传距离为 1.8%，表明标本属于单一物种。然而，北地的那些表现出一些遗传分化。I. abditus 受限制的栖息地、稀疏分布和一些遗传分化表明其保护状态应归类为“处于危险中”。LSID: urn:lsid:zoobank.org:pub:75C386BC-C0A5-4627-AE4B-8C5D749D53BA