27. Orientogalba ollula (Gould, 1859) Figs 8M; 9N; Table 3

Limnaea ollula Gould 1859: 40.

Limnaeus pervius von Martens 1867: 221.

Lymnaea viridis - Hubendick 1951: 162, fig. 351 (partim).

Galba pervia - Zhadin 1952: 176, fig. 77.

Lymnaea (Orientogalba) ollula - Kruglov and Starobogatov 1993b: 175, fig. 10C.

Orientogalba ollula - Vinarski and Kantor 2016: 357; Aksenova et al. 2018a: 4.

TL.

China, streams and marshes of Hong Kong Island.

Lectotype.

National Museum of Natural History, Smithsonian Institution, Washington, USA (Johnson 1964).

Though the type material of L. ollula Gould is extant, we were unable to study it. Instead, we examined a small series of shells of this species collected in Yokohama, Japan (NHMUK). Shell is ovoid, with shortened spire and strongly-inflated body whorls. Generally, it much resembles the shell of O. viridis and we could not delimit these two taxa by means of conchology. Like most species of radicines discussed above, O. ollula is characterised by the disproportion in sizes between the penis sheath and praeputium, the latter being much larger and broader (see Fig. 8M).

Taxonomic remark.

This species, described from eastern China, has usually been considered as a junior synonym of O. viridis (Hubendick 1951; Brandt 1974); however, Kruglov and Starobogatov (1993b) regarded it as a separate taxon. The results of our study allowed us to accept their opinion and use the name O. ollula to label a species of Orientogalba, widely distributed in China (found also in South Korea and Nepal). Perhaps, all recordings of " Lymnaea viridis " from Siberia, Russian Far East and Mongolia (Kruglov and Starobogatov 1985a, 1993b; Vinarski and Kantor 2016; Vinarski et al. 2017) should also be referred to as O. ollula .