| Summary: | A new water mite species, Halacarellus kamchatkaensis sp.n. (Acari: Halacaridae), collected in the freshwater lake Kuril’skoe in Kamchatka is described. This species is characterized by the following features: in both sexes, the anterodorsal plate with straight anterior margin and anterolateral notches, the ocular plates are wide and without eye lenses, the posterodorsal plate is pear-shaped; the genital valves with three acetabula each; in males, the genital acetabula are external, the genital plate with 23–27 perigenital setae on each side; in females, the genital acetabula are internal, the genital plate with one seta on each side.
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