Rhodacmea is a genus of small freshwater snails or limpets, aquatic gastropod mollusks in the family Planorbidae, the ram's horn snails and their allies.

[2] Rhodacmea is the type genus of the subfamily Rhodacmeinae.

[3] These animals have a pallial lung, as do all pulmonate snails, but they also have a false gill or "pseudobranch".

This serves as a gill, which is necessary as, in their non-tidal habitat, these limpets never reach the surface for air.

Species in the genus Rhodacmea include: