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<p>Broad distribution of <i>Eudontomyzon</i> lampreys with established local populations in the Western Dvina basin is documented. In several waterbodies, <i>Eudontomyzon</i> co-occurs with resident <i>Lampetra fluviatilis</i>, occupying the same larval habitats and spawning grounds. We examined key features of dentition to resolve taxonomic identity; most specimens were assigned to the <i>E</i>. <i>mariae</i> complex (as <i>Eudontomyzon</i> sp. “Dnieper”). We present detailed morphological descriptions and compare them with published data on European <i>Eudontomyzon</i> lampreys from other areas. Particular attention is given to the dentition, with an emphasis on tongue-like piston dentition in <i>Eudontomyzon</i> sp. “Dnieper” compared with the resident <i>L</i>. <i>fluviatilis</i>. Eight specimens display intermediate phenotypes, suggesting possible intergeneric hybridization. Our study not only extends the known range of <i>Eudontomyzon</i> but also raises questions about putative consequences of its sympatry with resident <i>L</i>. <i>fluviatilis</i>.</p>

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Morphology and geographic distribution of poorly studied lampreys (Eudontomyzon) from the Western Dvina basin

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Anzhelika V. Kolotei,
  • Boris A. Levin,
  • Aleksandr O. Zvezdin

摘要

Broad distribution of Eudontomyzon lampreys with established local populations in the Western Dvina basin is documented. In several waterbodies, Eudontomyzon co-occurs with resident Lampetra fluviatilis, occupying the same larval habitats and spawning grounds. We examined key features of dentition to resolve taxonomic identity; most specimens were assigned to the E. mariae complex (as Eudontomyzon sp. “Dnieper”). We present detailed morphological descriptions and compare them with published data on European Eudontomyzon lampreys from other areas. Particular attention is given to the dentition, with an emphasis on tongue-like piston dentition in Eudontomyzon sp. “Dnieper” compared with the resident L. fluviatilis. Eight specimens display intermediate phenotypes, suggesting possible intergeneric hybridization. Our study not only extends the known range of Eudontomyzon but also raises questions about putative consequences of its sympatry with resident L. fluviatilis.