Lymnaea (Lymnaea) stagnalis (Linnaeus, 1758)

(fig. 4 A, B)

Regional distribution. Two Mongolian localitieS of thiS wideSpread Holarctic SpecieS are known to the date. 1. Chono-Khoraikh gol RiVer in the Large LakeS DepreSSion (15.07.2012, leg. M.V. VinarSki; See coordinateS in the Appendix). 2. PoolS in the Orkhon RiVer floodplain near Shamor Settlement in Northern Mongolia (31.07.1982, leg. K.G. MikhailoV; ZMMU). PopoVa (1981) found L. stagnalis in the PleiStocene depoSitS of Mongolia.

Extra-limital distribution. L. stagnalis haS been recorded from other countrieS of Central ASia: AfghaniStan (Hubendick 1951), China (Liu Yueyin 1979), and Nepal (Glöer & Bößneck 2013; aS Lymnaea kashmirensis PraShad, 1925). The oVerall SpecieS' range iS Holarctic.

Variation. Two morphotypeS of thiS SpecieS haVe been recorded from Mongolia—the typical one, with relatiVely Short Spire and prominently inflated body whorl (See fig. 4 A), and the Second that iS characterized by much more Slender Shell and oblong Spire (See fig. 4 B). Some authorS (KrugloV & StarobogatoV 1985a, 1993a) regarded the latter morphotype aS a Separate SpecieS, Lymnaea fragilis (L., 1758), howeVer it haS been Shown that there are no SubStantial genetic differenceS between low-Spired and high-Spired SnailS, and L. fragilis iS nothing but an intraSpecific morphotype (Mezhzherin et al. 2008; VinarSki et al. 2012; VinarSki 2014, 2015a).