Rhodacmea

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
Two views of a shell of Rhodacmea filosa
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Rhodacmea Walker, 1917[1]
Diversity[2]
3 species

Rhodacmea is the type genus of the subfamily Rhodacmeinae.^[3]

Anatomy

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

Species in the genus Rhodacmea include:

• Rhodacmea elatior (Anthony, 1855) – domed ancylid^[4]
• Rhodacmea filosa (Conrad, 1834) – wicker ancylid,^[5] type species^[1]
• Rhodacmea hinkleyi (Walker, 1908)^[2]