is a genus of marine opecoelid digeneans that parasitize a wide variety of fish as adults. We present the first phylogenetic analysis of several isolates using nuclear 28S rDNA and mitochondrial 1 DNA regions. New sequences were obtained for specimens from fish caught in the Sea of Okhotsk and the White Sea. Based on morphological and molecular data, eight lineages of species rank were revealed. However, this diversity is poorly formalized within the current taxonomic model of the genus. As a result, we identified cf. cf. cf. , of Sokolov et al., 2019, sp. of Denisova et al., 2023, sp. 1, sp. 2 and sp. 3. We also highlight the unresolved question of the life cycles of representatives of whose intramolluscan stages parasitize the intertidal snails spp.
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