''Lithasia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of medium-sized

freshwater snail Freshwater snails are gastropod mollusks which 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 ...

s, aquatic gilled

gastropod The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusc Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is esti ...

s in the family

Pleuroceridae Pleuroceridae, common name pleurocerids, is a family of small to medium-sized freshwater snails, aquatic gilled gastropod mollusks in the superfamily Cerithioidea.These snails have an operculum and typically a robust high-spired shell. Reprodu ...

. This genus is endemic to rivers in the mid-southern United States.

Species

Species within the genus ''Lithasia'' include: * Armigerous river snail (''Lithasia armigera'') *

Knobby rocksnail The knobby rocksnail, scientific name ''Lithasia curta'', is a species of medium-sized freshwater snail, an aquatic gilled gastropod mollusk in the family Pleuroceridae. This species is endemic Endemism is the state of a species being found ...

(''Lithasia curta'') *

Dutton's river snail Dutton's river snail also known as the helmet rocksnail, scientific name ''Lithasia duttoniana'', is a species of freshwater snails with an operculum, aquatic gastropod mollusks in the family Pleuroceridae. This species is endemic to the Unit ...

(''Lithasia duttoniana'') *

Geniculate river snail The geniculate river snail or ornate rocksnail, scientific name ''Lithasia geniculata'', is a species of freshwater snails with an operculum, aquatic gastropod mollusks in the family Pleuroceridae. This species is endemic to the United States ...

(''Lithasia geniculata'') *

Jay's river snail Jay's river snail also known as the rugose rocksnail, scientific name ''Lithasia jayana'', is a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Pleuroceridae, the hornsnails. This speci ...

(''Lithasia jayana'') * Elk River file snail (''Lithasia lima'') * Muddy rocksnail (''Lithasia salebrosa'') * Varicose rocksnail (''Lithasia verrucosa'')

References

Nomenclator Zoologicus info
Pleuroceridae Taxa named by Samuel Stehman Haldeman Taxonomy articles created by Polbot {{Pleuroceridae-stub