''Caspia'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

of marine snails, brackish water snails and

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 with a

gill A gill () is a respiratory organ that many 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 respiration on land provided they ar ...

and an operculum, an aquatic gastropod

mollusk 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 es ...

in the family

Hydrobiidae Hydrobiidae, commonly known as mud snails, is a large cosmopolitan family of very small freshwater and brackish water snails with an operculum; they are in the order Littorinimorpha. Distribution Hydrobiidae are found in much of the wor ...

. ''Caspia'' is the type genus of the Caspiidae, that is a synonym of Pyrgulinae.

Species

Species within the genus ''Caspia'' include: * '' Caspia baerii'' Clessin & W. Dybowski in W. Dybowski, 1888 - type species, marineKantor Yu I., Vinarski M. V., Schileyko A. A. & Sysoev A. V. (published online on March 2, 2010). "Catalogue of the continental mollusks of Russia and adjacent territories"
Version 2.3.1
/ref> *'' Caspia brotzkajae'' Starobogatov in Anistratenko & Prisjazhnjuk, 1992 - marine *'' Caspia gaillardi'' (Tadjalli-Pour, 1977) - marine *'' Caspia gmelinii''

Clessin Stefan Clessin (13 November 1833, Würzburg – 21 December 1911, Regensburg) was a German malacologist. He served as a military officer, and from 1862 worked for the Bavarian railways. He was an editor of the '' Malakozoologische Blätter'' and m ...

& W. Dybowski in W. Dybowski, 1888 - marine *'' Caspia knipowitchi'' Makarov, 1938 - marine and brackish *'' Caspia logvinenkoi'' (Golikov & Starobogatov, 1966) - freshwater *'' Caspia makarovi'' (Golikov & Starobogatov, 1966) - freshwater and brackish *'' Caspia pallasii'' Clessin & W. Dybowski, 1887 *'' Caspia stanislavi'' Alexenko & Starobogatov, 1987 - freshwater and brackish *'' Caspia valkanovi'' (Golikov & Starobogatov, 1966)WoRMS (2011). ''Caspia valkanovi'' (Golikov & Starobogatov, 1966). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576361 on 2011-07-14 ;Species brought into synonymy: *''Caspia issykkulensis''

, 1894: synonym of '' Pseudocaspia issykkulensis'' (

, 1894)

References

Hydrobiidae {{Hydrobiidae-stub