EN
Phylogenetic position of Boleana umbilicata (Kuščer, 1932) from Močilnik spring in Slovenia, the type locality of the species, was inferred with ML technique using nucleotide sequences of mitochondrial cytochrome oxidase subunit I (COI) and nuclear 18S rRNA genes. Boleana belongs to the Hydrobiidae, Sadlerianinae, and Graziana is its sister taxon.