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<p><i>Dactylogyrus boli</i> (Monogenea: Dactylogyridae), a gill parasite of the danionid fish&#xa0;<i>Raiamas bola</i>, is redescribed based on freshly collected material from the Ghaghra River, Uttar Pradesh, India. Of 56 hosts examined, 15 were infected, yielding a prevalence of 26.79% and a mean intensity of 2.0 parasites per infected host. The redescription, based on phase-contrast microscopy, provides an updated and more precise morphological framework for the identification of&#xa0;<i>D. boli</i>&#xa0;and contributes to the documentation of monogenean diversity in Indian freshwater ecosystems. The species is now distinguished by a combination of the following morphological characters: dorsal anchors with a nearly straight shaft and sharply recurved point;&#xa0;a stout, transverse dorsal bar with rounded, fenestrated lateral ends; hook pairs that are equal to or longer than the anchors except pair VI; and a&#xa0;tubular male copulatory organ with swollen base and forming two clockwise coils, guided by a distally spatulate accessory piece. The present study also reports the first record of&#xa0;<i>D. boli</i>&#xa0;from the Ghaghra River, extending its known distribution within the Ganga drainage.</p>

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Redescription of Dactylogyrus boli Tripathi, 1957 (Monogenea: Dactylogyridae) from Raiamas bola (Hamilton, 1822) in the Ghaghra River, Uttar Pradesh, India

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Priyanka Rawat,
  • Sneha Prakash

摘要

Dactylogyrus boli (Monogenea: Dactylogyridae), a gill parasite of the danionid fish Raiamas bola, is redescribed based on freshly collected material from the Ghaghra River, Uttar Pradesh, India. Of 56 hosts examined, 15 were infected, yielding a prevalence of 26.79% and a mean intensity of 2.0 parasites per infected host. The redescription, based on phase-contrast microscopy, provides an updated and more precise morphological framework for the identification of D. boli and contributes to the documentation of monogenean diversity in Indian freshwater ecosystems. The species is now distinguished by a combination of the following morphological characters: dorsal anchors with a nearly straight shaft and sharply recurved point; a stout, transverse dorsal bar with rounded, fenestrated lateral ends; hook pairs that are equal to or longer than the anchors except pair VI; and a tubular male copulatory organ with swollen base and forming two clockwise coils, guided by a distally spatulate accessory piece. The present study also reports the first record of D. boli from the Ghaghra River, extending its known distribution within the Ganga drainage.