Radix (Peregriana) intermedia (Lamarck, 1822)

Anistratenko, V. V., Furyk, Yu. I., Anistratenko, O. Yu. & Degtyarenko, E. V., 2019, A Review Of Species Diversity, Distribution And Ecology Of Freshwater Gastropod Molluscs Inhabiting The Ukrainian Transcarpathian, Vestnik Zoologii 53 (5), pp. 349-374 : 366

Radix (Peregriana) intermedia (Lamarck, 1822)

Distribution. This is one of the widespread pond snails in Forest-Steppe and Polissia zones of Ukraine ( Stadnichenko, 2004) as well as in the Transcarpathian region ( Stadnichenko, Gyrin, 2011 a; Anistratenko et al., 2018). General distribution — Palearctic ( Vinarski, Kantor, 2016).

Remarks. Shell of specimen from the Transcarpathia is illustrated by Anistratenko et al. (2018: fig. 3 , N). In the Transcarpathia this species is the common snail inhabiting shallow zone of rivers and canals up to 500 m a. s. l. mostly associating with macrophytes; it also occurs in small natural or even artificial ponds: localities 3, 6, 12, 15, 16, 19, 27, 30, 44 and 46 ( fig. 1 ). Environmental conditions for the recorded populations of R. intermedia are presented in tables 1 and 2. This species shows close resemblance to R. balthica and can be distinguished from the latter by its higher spire and more oblong shell. The validity of name R. intermedia is accepted in Russian literature (e. g. Kruglov, 2005), while the Western European malacologists usually consider it as a synonym of R. balthica .

Figures

Fig. 3. Shells of Transcarpathian gastropod molluscs: 1 — Viviparus viviparus (locality 12); 2 — Contectiana contecta (locality 15); 3 — Viviparus sphaeridius (locality 12); 4 — Bithynia tentaculata (locality 15); 5 — Valvata (Cincinna) ambigua (locality 15); 6 — Bithynia troschelii (locality 13); 7 — Valvata (Cincinna) piscinalis (locality 22); 8 — Lithoglyphus naticoides (locality 9); 9–11 — Planorbis planorbis (locality 15); 12, 13 — Planorbarius corneus (locality 15). Scale bars are given for 1–3, 4–8, and 9–13 correspondingly.

Fig. 1. Map showing the localities of samples studied. Details for each sampling point are given in table 1.