The new species Epeorus (Caucasiron) bicolliculatus sp. nov. is described based on larvae and adults. Diagnostic characters are given with regard to the related species. The most pronounced difference is represented by protuberances on larval abdominal terga II-IX, present exclusively in E. (C.) bicolliculatus sp. nov. Primary data on the biology and distribution of the new species are also provided. Delimitation of the new species is verified by the analysis of COI (barcode) sequences. Barcode data for all Caucasian species of the subgenus Caucasiron are provided for the first time and compared with E. (C.) bicolliculatus sp. nov.

Institute of Entomology Biology Centre CAS Branišovská 31 CZ 37005 České Budějovice Czech Republic Faculty of Sciences University of South Bohemia Branišovská 31 CZ 370 05 České Budějovice Czech Republic

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