Radix (Peregriana) tumida (Held, 1836)

D i s t r i b u t i o n. The species is recently found in the Transcarpathian Region for the first time (Anistratenko et al., 2018: shell illustrated in fig. 3, P). Currently only four localities of R. tumida are discovered in the region: 10, 18, 21 and 25 (fig. 1, table 1). In Ukraine the species registered in all regions (Anistratenko, Сhernogorenko, 1989; Stadnichenko, 2004). General distribution — Northern Palearctic (Vinarski, Kantor, 2016).

Remarks. In the Transcarpathia R. tumida only inhabits well warmed up water of rivers of altitude zone in between 100 and 240 m a. s. l. (table 2) usually associating with vegetation. Shell of R. tumida resembles R. ampla differentiating by higher spire and less inflated aperture; some differences in the proportions of the copulatory organs of these two species exist too (see Anistratenko et al., 2018).