Radix (Radix) mongolica ( Yen, 1939 )

Marinskiy, Vadim V., 2017, Checklist of the freshwater snails (Mollusca: Gastropoda) of Mongolia, Zootaxa 4317 (1), pp. 45-78 : 58

Radix (Radix) mongolica ( Yen, 1939)

( fig. 4 J, K)

Regional distribution. The type locality of Radix mongolica iS Situated in Inner Mongolia ( Yen 1939). SitnikoVa et al. (2006) recorded R. mongolica from the HöVSgöl Lake (See fig. 4 K). SeVeral ShellS correSponding to ShellS of R. mongolica SenSu KrugloV (2005) were Sampled by uS from the Khar US Nuur Lake.

Extra-limital distribution. Central ASia and the RuSSian Far EaSt ( KrugloV 2005; VinarSki & Kantor 2016).

Morphology. Yen (1939) defined R. mongolica aS a rather Small-Sized SpecieS (Shell height of the holotype iS 8.0 mm only) that makeS it the SmalleSt Snail of the SubgenuS Radix S. Str . of Mongolia. The largeSt of the ShellS collected by uS in the Khar US Nuur Lake iS 14.0 mm tall. ThiS Radix SpecieS can be diStinguiShed from all SpecieS mentioned aboVe by the higheSt Spire in conjunction with relatiVely Small Shell Size.

Figures

FIGURE 4. Shells and genitalia of the lymnaeid snails discUssed in the paper. A— Lymnaea stagnalis (31.07.1982, floodplain of the Orkhon River, leg. Mikhailov). B— L. stagnalis (15.07.2012, Chono-Khoraikhgol River, leg. Vinarski). C— Ladislavella terebra (31.07.1982, floodplain of the Orkhon River, leg. Mikhailov). D, E— Galba sibirica (19.07.2012, Teellin-gol River, leg. Vinarski). F— G. truncatula, the copUlatory apparatUs (25.02.2010, Abkhazia, Gagra District, Wet shore of Inkit Lake, leg. Palatov). G – Radix auricularia (19.07.2012, Teellin-gol River, leg. Vinarski). H— Radix bactriana (13.07.2012, Khar Us NUUr Lake, leg. Vinarski). I— R. parapsilia (09.06.2009, Khovd River, leg. Maryinskiy). J— R. mongolica (13.07.2012, Khar Us NUUr Lake, leg. Vinarski). K— R. mongolica, a scalarid specimen (Hövsgöl Lake, leg. et det. Sitnikova, LIN). L— R. balthica (20.07.1967, Khar Dorgon NUUr Lake, leg. Zhaltsanova). M— R. intermedia, a paralectotype of Limnaea eversa (1877, Eter River near Dja-Dzassyk Monastery, leg. Potanin, ZIN). Scale bars 1 mm (E, F), 2 mm (C, I, J, K), 5 mm (A, B, G, H, L, M).