Morphological and molecular data onShimazu, 1974 (Digenea: Microphalloidea: Zoogonidae) ex(Günther, 1877) and taxonomic problems in Zoogoninae genera.

Abstract

New morphological and molecular data were generated for trematodes recovered from the intestines of the fishfrom two locations in the south of the Russian Far East. Morphologically, these trematodes are identical to(Microphalloidea: Zoogonidae) from Japan. According to results of phylogenetic analysis based on 28S rDNA sequence data,was closely related to, andappears as a sister taxon to these two species. Genetic distance values, calculated based on both 28S rDNA and ITS2 rDNA, betweenandrepresents an interspecific differentiation level. Our results have an ambiguous explanation, indicating that the implication of the presence of one or two compact vitellarial aggregations for the differentiation ofandshould be reconsidered or that our results open up the question of the taxonomical status of trematodes previously denoted asand