Ussuripaludina Zatravkin & Bogatov, 1987

Examined species: Ussuripaludina ussuriensis (Gerstfeldt, 1859) (Figs 4B, 5B, 7B).

Remarks: Ussuripaludina can be distinguished from the other viviparid genera studied by a concentric inverted-comma-shaped operculum that shows the following combination of characters: a shiny, smooth and convex nuclear region; a shiny and smooth scar region; a relatively large inner opercular region; and a narrow marginal region.