A taxonomic review was performed on cestodes of the genus Spassky, 1947 that parasitize different species of shrews in different regions of the northern Palearctic and in the Nearctic (Alaska, USA). Information on Palearctic cestodes published in various articles is summarized. An overview of the geographical distribution of the species is also presented. Currently, the genus includes 17 species. In the European part of the Palearctic, four species of the genus are registered; in the Asian part, 13 species; and on the American continent (Seward Peninsula, Alaska, USA), two species. Descriptions, illustrations, and differential diagnoses are given for a new species of , i.e. n. sp., which was found in shrews Dobson and Laxmann on Sakhalin Island. A unique feature of the new species is irregularly alternating genital pores in the uterus series in the strobila. Amended new differential features (positioning of the uterus relative to osmoregulatory canals and alternation of genital pores) of genus diagnosis and an identification key for spp. are presented.
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