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<p>A new genus and species of monogenean belonging to Axinidae, <i>Ondoella sajori</i> <b>n. g., n. sp.</b>, is described based on specimens collected from the gill of Japanese halfbeak, <i>Hyporhamphus sajori</i> (Temminck &amp; Schlegel) (Beloniformes: Hemiramphidae) from the Seto Inland Sea, Japan. <i>Ondoella</i> <b>n. g.</b> differs from all other genera of axinids mainly by the possession of an unarmed cirrus. <i>Ondoella </i><b>n. g.</b> is characterised by the following features: (i) the spherical cirrus present; (ii) spines on the cirrus absent; (iii) the genital pore with a crown of a row of spines; (iv) the elongate body; (v) the vaginal pore with a horn-like spine, and (vi) vaginal pore dorsolateral. The phylogenetic analysis based on 28S rDNA sequences suggests that <i>O. sajori</i> and Axinidae constitute a monophyletic group. A comprehensive list of parasites known to infect <i>H</i>. <i>sajori</i> provided.</p>

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A new species and a new genus of the family Axinidae (Polyopisthocotyla: Mazocraeidea) parasitic on Japanese halfbeak Hyporhamphus sajori (Beloniformes: Hemiramphidae) collected from the Seto Inland Sea, Japan

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  • 发表日期：

    2025年3月17日

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  • Rio Horikawa,
  • Masato Nitta,
  • Yusuke Kamio

摘要

A new genus and species of monogenean belonging to Axinidae, Ondoella sajori n. g., n. sp., is described based on specimens collected from the gill of Japanese halfbeak, Hyporhamphus sajori (Temminck & Schlegel) (Beloniformes: Hemiramphidae) from the Seto Inland Sea, Japan. Ondoella n. g. differs from all other genera of axinids mainly by the possession of an unarmed cirrus. Ondoella n. g. is characterised by the following features: (i) the spherical cirrus present; (ii) spines on the cirrus absent; (iii) the genital pore with a crown of a row of spines; (iv) the elongate body; (v) the vaginal pore with a horn-like spine, and (vi) vaginal pore dorsolateral. The phylogenetic analysis based on 28S rDNA sequences suggests that O. sajori and Axinidae constitute a monophyletic group. A comprehensive list of parasites known to infect H. sajori provided.