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<p>The type species of the trematode genus <i>Skrjabinolecithum</i>, <i>S. spasskii</i>, a parasite of mullets in the Russian Far East and Vietnam, was shown to possess three different variants of rDNA sequences in earlier studies. The goal of the present study is to clarify the taxonomic status of genetically different trematodes, considered <i>S. spasskii</i>, in the Russian Far East and Vietnam by means of new morphological and molecular data. For this study, trematodes of the genus <i>Skrjabinolecithum</i> were collected from mugilid fish from estuaries of rivers of the south of the Russian Far East and the Cat Ba Island, Vietnam. Preliminary species identification and detailed morphometric analysis were carried out using high-resolution light microscopy. Molecular differentiation and phylogenetic analyses were carried out based on nuclear 28S rDNA and mitochondrial <i>cox1</i> gene sequences. As a result, two morphotypes of <i>S. spasskii</i> were revealed, and two new species, <Emphasis Type="BoldItalic">S. kievkaense</Emphasis><b> n. sp.</b> and <Emphasis Type="BoldItalic">S. vietnamense</Emphasis><b> n. sp.</b>, were validated. These species have no qualitative differences in body form and in organ structure and arrangements but have some differences in metric parameters. The validity of the new species was confirmed by phylogenetic analysis based on the mitochondrial <i>cox1</i> gene sequence dataset.</p>

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New species of the genus Skrjabinolecithum (Digenea: Haploporidae) from the mullets in Russia, the Far East, and Vietnam: morphology and molecular data

  • 期刊论文

  • 发表日期：

    2026年1月17日

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  • Dmitry Atopkin,
  • Alina Beloded Vladimir Besprozvannykh

摘要

The type species of the trematode genus Skrjabinolecithum, S. spasskii, a parasite of mullets in the Russian Far East and Vietnam, was shown to possess three different variants of rDNA sequences in earlier studies. The goal of the present study is to clarify the taxonomic status of genetically different trematodes, considered S. spasskii, in the Russian Far East and Vietnam by means of new morphological and molecular data. For this study, trematodes of the genus Skrjabinolecithum were collected from mugilid fish from estuaries of rivers of the south of the Russian Far East and the Cat Ba Island, Vietnam. Preliminary species identification and detailed morphometric analysis were carried out using high-resolution light microscopy. Molecular differentiation and phylogenetic analyses were carried out based on nuclear 28S rDNA and mitochondrial cox1 gene sequences. As a result, two morphotypes of S. spasskii were revealed, and two new species, S. kievkaense n. sp. and S. vietnamense n. sp., were validated. These species have no qualitative differences in body form and in organ structure and arrangements but have some differences in metric parameters. The validity of the new species was confirmed by phylogenetic analysis based on the mitochondrial cox1 gene sequence dataset.