Bathyomphalus contortus (Linnaeus, 1758)

(fig. 6 G)

Regional distribution. ThiS Euro-Siberian SpecieS occurS only in WeStern Mongolia. Three Mongolian localitieS of B. contortus are known to the date: 1) Chono-Khoraikh gol RiVer (15.07.2012, leg. M.V. VinarSki), 2) Dorgon reSerVoir (26.08.2014, leg. A.A. Prokin), and 3) Nogoon Lake (18.06.1981, leg. D.-S. D. ZhaltSanoVa).

Extra-limital distribution. Northern and Central Palearctic (Glöer 2002; VinarSki & Kantor 2016).

Morphology. The Mongolian repreSentatiVeS of thiS SpecieS (See fig. 6 C) are almoSt indiStinguiShable from indiVidualS of B. contortus liVing in Europe and WeStern Siberia.