Checklist of the freshwater snails (Mollusca: Gastropoda) of Mongolia Author Marinskiy, Vadim V. text Zootaxa 2017 2017-01-01 4317 1 45 78 journal article 32235 10.11646/zootaxa.4317.1.2 d9650b33-97b2-4d9c-867b-79cd628daf8f 1175-5326 880022 Cd399D08-1Db1-4319-Aa0D-Db560C7C38Df Radix ( Peregriana ) tumida (Held, 1836) sensu Kruglov & Starobogatov ( Table 5 ; fig. 5 H ) Regional distribution. We found SeVeral SpecimenS phenotypically reSembling Radix tumida SenSu KrugloV & StarobogatoV (1993b) in a branch of a riVer inflowing to the Airag Nuur Lake, WeStern Mongolia (See Appendix). Extra-limital distribution. Europe and Siberia ( KrugloV 2005 ; VinarSki & Kantor 2016 ). Remarks. KrugloV & StarobogatoV (1993b; KrugloV 2005 ) deScribe thiS taxon aS a SpecieS of Peregriana conchologically intermediate between Radix balthica and R. ampla (Hartmann, 1821) . The taxonomic diStinctneSS of R. tumida aS well aS itS true identity remain controVerSial. Glöer (2002) treated it aS a Variety of R. auricularia , whereaS moSt WeStern European malacologiStS did not accept it aS a Separate taxon of any rank (e.g. Welther- SchulteS 2012 ). PoSSibly, R. tumida SenSu KrugloV & StarobogatoV iS a Synonym of Some other SpecieS of the SubgenuS Peregriana .