''Rhodacmea'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of small

freshwater snail Freshwater snails are gastropod mollusks that live in fresh water. There are many different families. They are found throughout the world in various habitats, ranging from ephemeral pools to the largest lakes, and from small seeps and springs t ...

s or

limpet Limpets are a group of aquatic snails with a conical gastropod shell, shell shape (patelliform) and a strong, muscular foot. This general category of conical shell is known as "patelliform" (dish-shaped). Existing within the class Gastropoda, ...

aquatic Aquatic means relating to water; living in or near water or taking place in water; does not include groundwater, as "aquatic" implies an environment where plants and animals live. Aquatic(s) may also refer to: * Aquatic animal, either vertebrate ...

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Planorbidae, the ram's horn snails and their allies.Ó Foighil D., Li J., Lee T., Johnson P., Evans R. & Burch J. B. (2011). "Conservation Genetics of a Critically Endangered Limpet Genus and Rediscovery of an Extinct Species". '' PLoS ONE'' 6(5): e20496. . ''Rhodacmea'' is the

type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearin ...

of the subfamily Rhodacmeinae.

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 A gill () is a respiration organ, respiratory organ that many aquatic ecosystem, aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow r ...

, 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 * ''

Rhodacmea filosa ''Rhodacmea filosa'', the wicker ancylid, is a species of small, air-breathing, freshwater snail or limpet, a pulmonate gastropod in the family (biology), family Planorbidae. ''Rhodacmea filosa'' is the type species of the genus ''Rhodacmea''. ...

'' (Conrad, 1834) – wicker ancylid, type species * '' Rhodacmea hinkleyi'' (Walker, 1908)

References

{{Taxonbar, from=Q3073248 Planorbidae Gastropod genera Taxonomy articles created by Polbot