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Re-evaluation of the taxonomic status of taxa recognized within the expanded concept of Sphincteristomum Oshmarin, Mamaev & Parukhin, 1961 and the related Lobatotrema Manter, 1963 (Digenea: Megaperidae).

Y F M Karar1, C K Blend2, A Mansour3

  • 1Department of Zoology & Entomology, Faculty of Sciences, https://ror.org/04349ry21New Valley University, Kharga, New Valley, Egypt.

Journal of Helminthology
|September 8, 2025

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Summary

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  • Re-evaluation Of The Taxonomic Status Of Taxa Recognized Within The Expanded Concept Of Sphincteristomum Oshmarin, Mamaev & Parukhin, 1961 And The Related Lobatotrema Manter, 1963 (digenea: Megaperidae).
    • This summary is machine-generated.

    This study clarifies the taxonomy of the trematode genera Sphincteristomum and Lobatotrema using morphology and molecular data. New species and revised genus concepts are proposed, resolving taxonomic ambiguity in these parasitic flatworms.

    Area of Science:

    • Helminthology
    • Parasitology
    • Molecular Phylogenetics
    • Taxonomy

    Background:

    • The taxonomic status of Sphincteristomum and Lobatotrema is controversial due to overlapping diagnostic characteristics and morphological ambiguities.
    • Previous classifications lacked clarity, necessitating a comprehensive re-evaluation of these digenean trematode genera.

    Purpose of the Study:

    • To resolve the taxonomic uncertainty surrounding Sphincteristomum and Lobatotrema.
    • To establish refined, restricted concepts for both genera based on detailed morphological and molecular analyses.
    • To clarify phylogenetic relationships within the Schistorchiinae and related subfamilies.

    Main Methods:

    • Comparative morphological descriptions of key specimens.
    • Molecular characterization and phylogenetic analyses using DNA sequence data.
    • Species delimitation analyses, multivariate analyses, and examination of host-parasite data.

    Main Results:

    • A refined concept for Sphincteristomum (sensu stricto) including S. acollum and S. nikolaevi, and Lobatotrema including L. aniferum and the new species L. droneni.
    • The taxonomic status of S. mediterraneae was identified as problematic, showing an intermediate position between Megaperinae and Schistorchiinae.
    • Molecular data elucidated phylogenetic relationships within Schistorchiinae, highlighting the importance of oral sucker and sphincter morphology.

    Conclusions:

    • The study provides a robust taxonomic framework for Sphincteristomum and Lobatotrema, resolving long-standing ambiguities.
    • Phylogenetic analyses support a close relationship between Schistorchiinae and Megaperinae, contributing to our understanding of digenean trematode evolution.
    • Revised genus definitions and the description of a new species enhance the accuracy of helminth taxonomy and biodiversity assessment.
    Keywords:
    BiodiversityLobatotremaMolecular phylogenyMultivariate analysisSphincteristomum

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