Radix (Radix) obliquata (Martens, 1864)

Marinskiy, Vadim V., 2017, Checklist of the freshwater snails (Mollusca: Gastropoda) of Mongolia, Zootaxa 4317 (1), pp. 45-78 : 57

Radix (Radix) obliquata (Martens, 1864)

( Table 4; fig. 5 B)

Regional distribution. ThiS SpecieS inhabitS large mountain lakeS of Central ASia and it haS SeVeral timeS been regiStered from Mongolia (Möllerdorff, 1901; Yen, 1939; IzzatullaeV & StarobogatoV 1985; KrugloV, 2005). We report R. obliquata from a few WeStern Mongolia lakeS (Khar Nuur, Khoit Dalai Nuur). AlSo, a large Sample of ShellS of thiS SpecieS (ZIN) waS collected from an unnamed lake in the UVS Nuur depreSSion (See fig. 5 B).

Extra-limital distribution. The type locality of Radix obliquata iS ISSyk-Kul’ Lake, KyrgyzStan ( VinarSki 2016a). Yen (1942) alSo mentioned it from lakeS of Tibet (aS R. auricularia obliquata ). It iS alSo known from TuVa ( ProzoroVa & Sharyi-Ool 1999).

Morphology. R. obliquata iS characterized by large auriculate Shell with Very wide aperture, Strongly conVex whorlS and prominently concaVe tangent line. The columellar depreSSion iS uSually Very prominent.

Figures

FIGURE 5. Shells of the lymnaeid snails discUssed in the paper (continUation). A— Limnaea auricularia morpha kosogolensis, a syntype (ZIN, leg. Mikhno, det. Lindholm). B— Radix obliquata (06.1978, Uvs NUUr Depression, an Unnamed lake, leg. Lobachev, ZIN). C— R. lagotis (01.08.2011, Khar NUUr Lake, UnknoWn collector, LIN). D— R. obliquata, shell spire, enlarged (19.07.2012, Khar Us NUUr Lake, leg. Vinarski). E— R. zazurnensis (21.07.1990, KhUrkh River in the Onon River basin, leg. DUlmaa, ZIN). F— Lymnaea nogoonica, the holotype (22.08.1978, a lake near Kosh-Agach settlement near the RUssian- Mongolian border, leg. Starobogatov, ZIN). G— L. tsalolikhini, the holotype (27.06.1978, a bay of the Nogoon Lake, leg. Tsalolikhin, ZIN). H— R. tumida (23.07.2012, branch of a river infloWing to the Airag NUUr Lake, leg. Vinarski). I— Orientogalba viridis (20.08.1976, Khovd River, leg. Zhaltsanova). J— O. hookeri (10.06.1987, Bayan NUUr Lake, 80 km E from the Uvs NUUr Lake, leg. Tsalolikhin, ZIN). K— R. kurejkae (27.06.1978, a bay of the Nogoon Lake, leg. Tsalolikhin, ZIN). Scale bars: 2 mm (A, C, E – K), 5 mm (B). All photos are original, except of I (photo made by Ivan Nekhaev).