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  • Title: Phylogenetic position of Atriophallophorus minutus (Trematoda: Microphallidae), the type-species of the genus Atriophallophorus Deblock & Rosé, 1964, based on partial 28S rDNA gene sequence.
    Author: Shchenkov SV, Sokolov SG, Denisova SA.
    Journal: Parasitol Int; 2022 Apr; 87():102534. PubMed ID: 34971813.
    Abstract:
    We found metacercariae of a microphallid trematode Atriophallophorus minutus in freshwater snails Bithynia tentaculata. In this study, we provide a morphological description of whole-mount specimens and semi-thin sections of experimentally grown adults of this species. Our morphological examination supports the idea that the adults of Atriophallophorus spp. have a ventral sucker with a sinistral interruption of the outer edge. In the 28S rDNA gene-based phylogenetic analyses, our specimens of A. minutus were grouped into Atriophallophorus spp. clade, as a sister taxon to Atriophallophorus winterbourni + Atriophallophorus sp. Analysis of the pairwise genetic distances between coI mtDNA gene sequences revealed a low divergence between the two specimens of A. minutus (1.1%) and a greater divergence (up to 16.6%) between them and A. winterbourni. Since other Atriophallophorus spp. are known to have a strict specificity to the polyvalent intermediate host, we suggest that A. minutus reported from different snail species may represent a complex of cryptic species.
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