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<p>Since knowledge on the biodiversity of marine benthic diatoms from the Arctic-North Atlantic region is still limited, a detailed examination of unialgal strains was undertaken using light microscopy, scanning electron microscopy and molecular markers. Three samples were collected from marine habitats along the west coast of Iceland and eight unialgal strains representing six taxa were established. The combined evidence from micromorphological and morphometric traits, together with molecular data support the description of five new species. Three of them belong to the genus <i>Navicula</i> Bory: <i>Navicula jahniae</i> sp. nov., <i>Navicula vesturlandica</i> sp. nov. and <i>Navicula pseudoperminuta</i> sp. nov. In addition, <i>Nitzschia olafsvikensis</i> sp. nov. and <i>Tryblionella ytritungaensis</i> sp. nov. are described. Also included in this study is a species with cosmopolitan distribution, <i>Navicula gregaria</i> Donkin<i>.</i> The Icelandic strain exhibits molecular differences compared to strains from other localities, suggesting the existence of geographically distinct populations. The high number of new species observed in this study, based on only eight strains, suggests that a considerable degree of unknown diversity still exists among marine benthic diatoms. Consequently, careful taxonomic work remains necessary in under-explored coastal regions such as Iceland.</p>

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Hidden diversity in Icelandic marine benthic diatoms: five new species revealed by integrative taxonomy

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月1日

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  • Katherina Schimani,
  • Wolf-Henning Kusber,
  • Oliver Skibbe,
  • Jonas Zimmermann,
  • Lara R. Prelle,
  • Ulf Karsten,
  • Andreas Holzinger,
  • Nélida Abarca

摘要

Since knowledge on the biodiversity of marine benthic diatoms from the Arctic-North Atlantic region is still limited, a detailed examination of unialgal strains was undertaken using light microscopy, scanning electron microscopy and molecular markers. Three samples were collected from marine habitats along the west coast of Iceland and eight unialgal strains representing six taxa were established. The combined evidence from micromorphological and morphometric traits, together with molecular data support the description of five new species. Three of them belong to the genus Navicula Bory: Navicula jahniae sp. nov., Navicula vesturlandica sp. nov. and Navicula pseudoperminuta sp. nov. In addition, Nitzschia olafsvikensis sp. nov. and Tryblionella ytritungaensis sp. nov. are described. Also included in this study is a species with cosmopolitan distribution, Navicula gregaria Donkin. The Icelandic strain exhibits molecular differences compared to strains from other localities, suggesting the existence of geographically distinct populations. The high number of new species observed in this study, based on only eight strains, suggests that a considerable degree of unknown diversity still exists among marine benthic diatoms. Consequently, careful taxonomic work remains necessary in under-explored coastal regions such as Iceland.