Ladislavella terebra (Westerlund, 1885)

Anistratenko, Vitaliy V., Vinarski, Maxim V., Anistratenko, Olga Yu., Furyk, Yurii I. & Degtyarenko, Elena V., 2018, New data on pond snails (Mollusca: Gastropoda: Lymnaeidae) inhabiting the Ukrainian Transcarpathian: diversity, distribution and ecology, Ecologica Montenegrina 18, pp. 1-14 : 9-10

Ladislavella terebra (Westerlund, 1885)

( Fig. 3 , G, H; 4 , A)

Distribution: The species was found at a single locality 17 ( Table 1) close to the site in the vicinity Khust settlement where Korniushin (1999) has already recorded the species from an artificial pond. Under the name Galba occulta Jackiewicz, 1959 it was earlier mentioned from adjacent Ivano-Frankovsk and Lvov regions ( Stadnichenko 1968). Its actual distribution in Ukraine needs to be clarified. General distribution – Northern Palearctic (Eastern Europe to Eastern Siberia).

Remarks: In the Transcarpathian the species is found on hard substrate in shallow natural stagnant reservoir.

Taxonomic remarks: Recently it was shown ( Vinarski & Glöer 2008) that Galba occulta Jackiewicz, 1959 is a junior synonym of Limnaea palustris var. terebra Westerlund, 1885 . The most characteristic trait of this species allowing its easy identification is the structure of the copulatory organ ( Fig. 4 , A). The praeputium is dark pigmented (sometimes almost black), whereas the penis sheath is light coloured, its width is almost the same as the praeputium width (see Korniushin 1999; Vinarski 2003, 2012 for further details).

Figures

Figure 3. Shells of pond snails found. A – Lymnaea stagnalis from locality 16; B – L. fragilis, locality 7; C – Stagnicola corvus, locality 8; D – Galba truncatula, locality 21; E – G. subangulata, locality 16; F – G. oblonga, locality 4; G, H – Ladislavella terebra, loc. 17; I – Radix auricularia, locality 3; J, K – R. parapsilia, locality 10; L – R. ampullаcea, locality 3; M – R. balthica, locality 2; N – R. intermedia, locality 4; O – R. ampla, locality 15; P – R. tumida, locality 15. Scale bar = 10 mm for A–C and 5 mm for D–P.

Figure 4. The copulatory organs of some lymnaeid snails from the Transcarpathian region. A – Ladislavella terebra; B – Radix ampla; C – R. tumida. Scale bars = 1 mm for A and 2 mm for B, C. Abbreviations: pp – praeputium, ps – penis sheath.