Valvata (Sibirovalvata) confusa Westerlund, 1897

Marinskiy, Vadim V., 2017, Checklist of the freshwater snails (Mollusca: Gastropoda) of Mongolia, Zootaxa 4317 (1), pp. 45-78 : 53

Valvata (Sibirovalvata) confusa Westerlund, 1897

( fig. 2 E)

Regional distribution. We found two ShellS of Valvata confusa in a Sample from Terkhiyn TSagaan Nuur lake (ZhaltSanoVa collection). ThiS mountain lake iS Situated in Central Mongolia (See Appendix for coordinateS). Other localitieS of V. confusa in Mongolia are unknown. ThiS taxon, the type SpecieS of the SubgenuS Sibirovalvata StarobogatoV et Streletzkaja, 1967, iS for the firSt time recorded here from Mongolia.

Extra-limital distribution. The oVerall range of thiS SpecieS embraceS almoSt entire ASiatic RuSSia, from WeStern Siberia to Chukotka, Kamchatka, Sakhalin, and Kurile ISlandS (SitnikoVa et al. 2015). It iS known from the RuSSian partS of the Selenga and Amur RiVerS adjacent to Mongolia (SitnikoVa et al. 2015).

Morphology. The Shell of thiS SpecieS iS oVate conical with more or leSS prominent Spire and conVex almoSt Stepped whorlS (See fig. 2 E). The Shell Surface iS heaVily ribbed.

Figures

FIGURE 2. Valvatidae of Mongolia. A— Ƒalvata depressa (18.07.2012, Airag NUUr Lake, leg. Palatov & Vinarski). B— Ƒ. antiqua (Darkhad depression, sampling date UnknoWn, leg. Zhaltsanova). C— Ƒ. sibirica f. typica (01.08.1980, Ugiy NUUr Lake, leg. Zhaltsanova). D— Ƒ. sibirica f. frigida (20.08.2010, Zavkhan River, leg. Prokin). E— Ƒ. confusa (01.08.1980, Terkhiyn Tsagaan NUUr lake, leg. Zhaltsanova). F— Ƒ. brevicula (from an UnknoWn Waterbody, leg. Zhaltsanova). Scale bars 2 mm (except of C— 1 mm).