''Marstoniopsis'' 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 minute

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 are ...

and an operculum, aquatic

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 ...

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 e ...

s or

micromollusk A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also ...

s in the family

Amnicolidae Amnicolidae is a family of small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the superfamily Rissooidea. This family is in the clade Littorinimorpha (according to the taxonomy of the Gastropoda by Bouchet & R ...

Species

Species within the genus ''Marstoniopsis'' include: * ''

Marstoniopsis armoricana ''Marstoniopsis'' is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks or micromollusks in the family Amnicolidae. Species Species within the genus ''Marstoniopsis'' include: * '' Marstoniopsis arm ...

'' (Paladilhe, 1869) * ''

Marstoniopsis croatica ''Marstoniopsis'' is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks or micromollusks in the family Amnicolidae. Species Species within the genus ''Marstoniopsis'' include: * '' Marstoniopsis arm ...

'' Schütt, 1974 * ''

Marstoniopsis graeca ''Marstoniopsis'' is a genus of minute freshwater snails with a gill and an operculum, aquatic gastropod mollusks or micromollusks in the family Amnicolidae. Species Species within the genus ''Marstoniopsis'' include: * '' Marstoniopsis arm ...

'' (Radoman, 1978) * ''

Marstoniopsis insubrica ''Marstoniopsis insubrica'' is a species of minute freshwater snail with an operculum, an aquatic gastropod mollusk or micromollusk in the family Amnicolidae. This is a critically endangered species. Distribution This species lives in some ...

'' (Küster, 1853) - synonym: ''Marstoniopsis scholtzi'' (Schmidt, 1856) * '' Marstoniopsis vrbasi'' Bole & Velkovrh, 1987

References

External links

Amnicolidae {{Amnicolidae-stub