Abstract
Results of faunistic research of aquatic Coleoptera in seven Natura 2000 Sites of Community Importance are presented in this paper. Altogether, 50 species were recorded. One species, Helochares (Helochares) punctatus Sharp, 1869, is recorded as new to the fauna of Slovakia. Three very rare species in Slovakia (Dryops similaris Bollow 1936, Limnius intermedius Fairmaire, 1881, and Hydraena excisa Kiesenwetter, 1849) were found at new sites. First faunistic records on aquatic Coleoptera from two important protected sites are presented. Furthermore, data on the occurrence of several species and on the water beetle diversity of partial river basins of Slovakia were considerably extended.