Gyraulus terekholicus (Prozorova et Starobogatov, 1997)

Marinskiy, Vadim V., 2017, Checklist of the freshwater snails (Mollusca: Gastropoda) of Mongolia, Zootaxa 4317 (1), pp. 45-78 : 66

Gyraulus terekholicus (Prozorova et Starobogatov, 1997)

( fig. 7 A)

Regional distribution. ThiS SpecieS waS mentioned for Mongolia (HöVSgöl Lake) by SitnikoVa et al. (2006). We identified G. terekholicus in SampleS from three large lakeS of WeStern Mongolia—Dorgon , Khar, and Nogoon. In all three caSeS only empty ShellS were aVailable that makeS our identification proViSional.

Extra-limital distribution. The type locality of G. terekholicus iS the Tere-Khol’ Lake , Situated in TuVa Republic near the RuSSian-Mongolian border ( ProzoroVa & StarobogatoV 1997).

Morphology. Conchologically, G. terekholicus reSembleS G. chinensis but haS a little higher number (about 20) of the proState diVerticleS (SitnikoVa et al. 2006), whereaS in the latter SpecieS thiS number lieS between 12 and 17 ( Appleton & Miranda 2015).

Figures

FIGURE 7. Shells of planorbid snails discUssed in the paper. A. — Gyraulus terekholicus (09.07.1996, Hövsgöl Lake, the Khankh River moUth, leg. Sitnikova). B— G. kruglowiae, a probable syntype (19.08.1936, Central Altai Mts., Ten’ga Lake, leg. Johansen; ZMMU). C— G. kruglowiae (29.03.1981, Tolbo NUUr Lake, leg. Zhaltsanova). D— G. infraliratus, a syntype (Siberia, Nizhny Imbatsk, det. WesterlUnd; NMG). E— G. infraliratus (10.06.2010, Nariyn gol River, leg. Palatov & Maryinskiy). F— G. stroemi (12.07.2012, a pool in the Khovd River floodplain, leg. Vinarski). G— Helicorbis kozhovi (07.05.1977, Khalkh River, leg. Zhaltsanova). H— Polypylis sibirica (23.08.1987, Tsagaan NUUr Lake, leg. DUlmaa; ZIN). Scale bars: 2 mm. Fig. D after Vinarski et al. (2013), slightly modified.