Scholarlink

<p>A new nicothoid copepod species <i>Rhizorhina hamatipedicola</i> <b>n. sp.</b> is described, parasitic on the tanaidacean <i>Hamatipeda kohtsukai</i> Kakui &amp; Hiruta (Hamatipedidae) collected at depths of 360–375 m in Sagami Bay, Japan, in the northwestern Pacific. It closely resembles <i>Rhizorhina aesthetes</i> Boxshall &amp; Harrison, 1988 parasitic on an ischnomesid isopod collected at a depth of about 2910 m in the northeastern Atlantic, and <i>Rhizorhina ohtsukai</i> Kakui, 2016 parasitic on the leptocheliid tanaidacean <i>Chondrochelia sublitoralis</i> Sato, Arakawa, &amp; Kakui collected at depths of 151–136 m in the northwestern Pacific. Although there are only minor morphological differences between these <i>Rhizorhina</i> species, their hosts differ at the level of order or family. The known geographical and depth distributions of <i>R. hamatipedicola</i> differ greatly from those of <i>R. aesthetes</i>. A partial nucleotide sequence of the 18S rRNA (18S) gene from <i>R. hamatipedicola</i> was identical to that from <i>R. ohtsukai</i>, but the two species differed by 13.4% and 14.9% p- and K2P distances, respectively, for the cytochrome <i>c</i> oxidase subunit I (COI) gene, which were much greater than intraspecific distances previously reported in Siphonostomatoida. This study suggests that an integrative approach combining morphology, sequences of COI or other genes evolving faster than 18S, and host data is necessary to reliably distinguish among morphologically similar <i>Rhizorhina</i> species.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Rhizorhina hamatipedicola n. sp. (Copepoda: Siphonostomatoida: Nicothoidae) parasitic on a tanaidacean crustacean, with a note on the effectiveness of COI and 18S data in Rhizorhina taxonomy

  • 期刊论文

  • 发表日期：

    2026年1月21日

查看全文
  • K. Kakui

摘要

A new nicothoid copepod species Rhizorhina hamatipedicola n. sp. is described, parasitic on the tanaidacean Hamatipeda kohtsukai Kakui & Hiruta (Hamatipedidae) collected at depths of 360–375 m in Sagami Bay, Japan, in the northwestern Pacific. It closely resembles Rhizorhina aesthetes Boxshall & Harrison, 1988 parasitic on an ischnomesid isopod collected at a depth of about 2910 m in the northeastern Atlantic, and Rhizorhina ohtsukai Kakui, 2016 parasitic on the leptocheliid tanaidacean Chondrochelia sublitoralis Sato, Arakawa, & Kakui collected at depths of 151–136 m in the northwestern Pacific. Although there are only minor morphological differences between these Rhizorhina species, their hosts differ at the level of order or family. The known geographical and depth distributions of R. hamatipedicola differ greatly from those of R. aesthetes. A partial nucleotide sequence of the 18S rRNA (18S) gene from R. hamatipedicola was identical to that from R. ohtsukai, but the two species differed by 13.4% and 14.9% p- and K2P distances, respectively, for the cytochrome c oxidase subunit I (COI) gene, which were much greater than intraspecific distances previously reported in Siphonostomatoida. This study suggests that an integrative approach combining morphology, sequences of COI or other genes evolving faster than 18S, and host data is necessary to reliably distinguish among morphologically similar Rhizorhina species.