Species diversity of gamasid mites was studied based on data from a long-term survey of 11 species of small mammals (six species of Rodentia and five species of Soricomorpha) in the middle taiga of Karelia. Six families, 17 genera, and 25 species werefound. Parasitidae (8) and Laelapidae (7 species) have the highest species richness. The structure of the fauna is heterogeneous, ranging from free-living mites to permanent external parasites, with parasitic mites quantitatively dominating. The core ofthe fauna includes parasitic species with wide Palaearctic distribution: Echinonyssus eusoricis, E. isabellinus, Hyperlaelaps arvalis, Haemolaelaps dogieli, Eulaelaps stabutaris Koch, 1836, and Laelaps Man's Koch, 1836. The bank vole, field vole and root vole have the highest species diversity of parasitic gamasid mites.
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