Viviparus sphaeridius (Bourguignat, 1880) (fig. 3, 3)

D i s t r i b u t i o n. The general distribution of V. sphaeridius includes lakes of south part of Alps, Danube, Dniester and Dnipro rivers basins (Anistratenko, Anistratenko, 2001). In Ukraine it occurs in the Dniester and Dnipro basins as well as in the mouth of Danube. In the Transcarpathian Region the species is recently reported for the first time (Anistratenko et al., 2018); currently it recorded in two localities: 8 and 12 (fig. 1, table 1).

Remarks. In the Transcarpathia V. sphaeridius occurs sporadically at same biotopes where V. viviparus live. The shell characteristics of V. sphaeridius from Transcarpathia match well the original description of Vivipara sphaeridia Bourguignat, 1880, syntypes as well as topotypes of this species collected in the Danube near Marten, Bulgaria (Glöer, Georgiev, 2014).