16. Bythinella opaca (M. von Gallenstein, 1848)

Findings in Serbia.

Bythinella opaca opaca: Karaman & Karaman (2007).

Bythinella schmidti schmidti: Radoman (1983) .

Bythinella opaca: Jaeckel et al. (1958) .

Morphology. Minute snails, up to 3.3 mm high. Shell is cylindrical-conical. Aperture is ovoid, umbilicus is slit like, or closed. For more details see Radoman (1983: 172, pl. 12, fig. 204).

Distribution and ecology. Alpine and Dinaric spring species. In Serbia, the most common representative of the genus. Reported from springs and brook systems from Ibar, Drina and Zapadna Morava catchments.

Other remarks. Being the only widely distributed species of the genus, and with fairly isolated spring populations, a few subspecies of this snail were recognized (Radoman 1983). On the IUCN Red List it has been assessed as LC (Fehér 2010 a).