Pomatiopsidae is a family of small, mainly freshwater snails, (some also occur in other habitats) that have gills and an operculum, aquatic gastropod mollusks in the superfamily Truncatelloidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

[1] The generic diversity of Pomatiopsinae is particularly high in the Japanese Archipelago, where four of the eight genera, including two endemics, are recorded.

[1] The subfamily Triculinae radiated as aquatic snails in freshwater habitats in Southeast Asia.

[1][13] Terrestrial taxa occur only on the Japanese Archipelago located in East Asia (Blanfordia).

[1] Tomichia and Coxiella include several halophilic species occurring on saline lakes.