Troschel, 1857
Shell small, conical, smooth; aperture car-shaped or oval, with complete peristome; operculum spiral and horny. Animal with long, bifid snout; mantle edge with or without pallial tentacle; foot folding transversely into anterior and posterior halves, latter with a median mucus gland.
Source: Hayward et al., 1990.
The following subtaxa of this family occur in the region:
Genus Hydrobia
Hydrobia neglecta
Hydrobia ulvae
Genus Mercuria
Mercuria confusa
Genus Potamopyrgus
Potamopyrgus antipodarum
Genus Semisalsa
Semisalsa stagnorum
Genus Ventrosia
Ventrosia ventrosa