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<p>We describe two new <i>Janirella</i> species, <i>Janirella scutum</i> sp. n. and <i>Janirella spinoscutum</i> sp. n., collected at depths of 2893–3176&#xa0;m on the landward slope of the Japan Trench, northwestern Pacific. These species differ from congeners in having a fusiform body with dorsal spines on each pereonite; and the pleotelson with two pairs of short and one pair of long lateral projections; rostrum as long as cephalothorax, tip concave, with two distal spines. They differ from one another in the number and size of dorsal spines on the pereonites. We determined partial sequences for the cytochrome <i>c</i> oxidase subunit I (COI) gene for the two new species and seven other <i>Janirella</i> species and constructed a COI-based maximum-likelihood tree of <i>Janirella</i>. In the tree, the subgenus <i>Parjanirella</i> was monophyletic but embedded within a paraphyletic group of species in the subgenus <i>Janirella</i>. Based on this result, we propose the elimination of subgenus ranks in <i>Janirella</i>.</p>

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Integrative taxonomy of Janirella (Isopoda: Asellota: Janirellidae), with descriptions of two new species from the Japan Trench and an amended classification of the genus

  • 期刊论文

  • 发表日期：

    2025年3月11日

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  • Mizuki Ohta,
  • Keiichi Kakui,
  • Shigeaki Kojima,
  • Michitaka Shimomura

摘要

We describe two new Janirella species, Janirella scutum sp. n. and Janirella spinoscutum sp. n., collected at depths of 2893–3176 m on the landward slope of the Japan Trench, northwestern Pacific. These species differ from congeners in having a fusiform body with dorsal spines on each pereonite; and the pleotelson with two pairs of short and one pair of long lateral projections; rostrum as long as cephalothorax, tip concave, with two distal spines. They differ from one another in the number and size of dorsal spines on the pereonites. We determined partial sequences for the cytochrome c oxidase subunit I (COI) gene for the two new species and seven other Janirella species and constructed a COI-based maximum-likelihood tree of Janirella. In the tree, the subgenus Parjanirella was monophyletic but embedded within a paraphyletic group of species in the subgenus Janirella. Based on this result, we propose the elimination of subgenus ranks in Janirella.