Pisidium is a genus

Genera

Genera is a commercial operating system and development environment for Lisp machines developed by Symbolics. It is essentially a fork of an earlier operating system originating on the MIT AI Lab's Lisp machines which Symbolics had used in common with LMI and Texas Instruments...

 of very small or minute freshwater clams known as pill clams or pea clams, aquatic

Aquatic animal

An aquatic animal is an animal, either vertebrate or invertebrate, which lives in water for most or all of its life. It may breathe air or extract its oxygen from that dissolved in water through specialised organs called gills, or directly through its skin. Natural environments and the animals that...

 bivalve molluscs in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

  Sphaeriidae

Sphaeriidae

The Sphaeriidae are a family of small to minute freshwater bivalve molluscs, in the order Veneroida. In the USA they are commonly known as the pea clams and the fingernail clams.-Genera:Genera in the family Sphaeriidae include:* Musculium...

.

Subgenera and species

Subgenera and species within the genus Pisidium include:

subgenus Euglesa Jenyns, 1832

• Pisidium casertanum
  Pisidium casertanum
  Pisidium casertanum, the pea cockle or pea clam, is a minute freshwater bivalve mollusc of the family Sphaeriidae.- Description :...
  
  (Poli, 1791)
• Pisidium globulare
  Pisidium globulare
  Pisidium globulare is a species of freshwater bivalve from family Sphaeriidae.-Distribution:* Czech Republic - in Bohemia, in Moravia* Germany - North Rhine-Westphalia, Schleswig-Holstein, Mecklenburg-Western Pomerania* Latvia* Slovakia* Sweden...
  
  Clessin, 1873
• Pisidium personatum
  Pisidium personatum
  Pisidium personatum is a species of freshwater bivalve from the Family Sphaeriidae.-Distribution:It's native distribution is European-Siberian.* Czech Republic - in Bohemia, in Moravia, least concern...
  
  Malm, 1855

subgenus Pisidium Pfeiffer

Ludwig Karl Georg Pfeiffer

Ludwig Karl Georg Pfeiffer, also known as Louis Pfeiffer was a German physician, botanist and conchologist.-Biography:He received his education in Kassel, and became professor of pathology there in 1828...

, 1821

• Pisidium amnicum
  Pisidium amnicum
  Pisidium amnicum is a species of very small freshwater clam. It is sometimes known as the greater European peaclam, an aquatic bivalve in the family Sphaeriidae.-Description:...
  
  (O. F. Müller, 1774)
• Pisidium dilatatum Westerlund, 1897
• †Pisidium clessini
  Pisidium clessini
  Pisidium clessini is a species of extinct freshwater bivalve from family Sphaeriidae.-Description:The shell has an oval form with somewhat prominent umbo, that is situated behind the middle. There is a distinct concentric rib structure. The ribs are sharp and are separated by relatively big spaces...
  
  Neumayr, 1875

subgenus Cyclocalyx Dall, 1903

• Pisidium hinzi Kuiper, 1975
• Pisidium obtusale
  Pisidium obtusale
  Pisidium obtusale is a species of freshwater bivalve from family Sphaeriidae.-Distribution:It's native distribution is Holarctic.* Czech Republic - in Bohemia, in Moravia, near threatened * Germany -...
  
  (Lamarck, 1818)

subgenus Tropidocyclas Dall, 1903

• Pisidium henslowanum
  Pisidium henslowanum
  Pisidium henslowanum is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae.-Distribution:It's native distribution is Holarctic.* Czech Republic - in Bohemia, in Moravia, least concern...
  
  (Sheppard, 1823)
• Pisidium lilljeborgii
  Pisidium lilljeborgii
  Pisidium lilljeborgii is a species of freshwater bivalve from family Sphaeriidae.-Distribution and conservation status:* Not listed in IUCN red list - not evaluated * Germany - high endangered...
  
  Clessin, 1886
• Pisidium supinum
  Pisidium supinum
  Pisidium supinum is a species of minute freshwater clam, a pea clam, an aquatic bivalve mollusc in the family Sphaeriidae The shell of this species is 3 to 5 mm in size, and is roughly triangular in shape....
  
  A. Schmidt, 1851
• Pisidium waldeni Kuiper, 1975

subgenus Henslowiana Fagot, 1892

subgenus Hiberneuglesa Starobogatov, 1983

• Pisidium hibernicum
  Pisidium hibernicum
  Pisidium hibernicum is a species of freshwater bivalve from family Sphaeriidae.-Distribution:It's native distribution is Palearctic.* Czech Republic - endangered , endangered in Bohemia , critically endangered in Moravia* Slovakia...
  
  Westerlund, 1894

subgenus Cingulipisidium Pirogov & Starobogatov, 1974

• Pisidium crassum Stelfox, 1918
• Pisidium milium
  Pisidium milium
  Pisidium milium is a species of very small freshwater bivalve in the family Sphaeriidae, the fingernail clams and pea clams.-Distribution :The native distribution of this species is Holarctic.* Czech Republic - in Bohemia, in Moravia, vulnerable...
  
  Held, 1836
• Pisidium nitidum
  Pisidium nitidum
  Pisidium nitidum or the "shining pea clam" is a species of minute freshwater clam, an aquatic bivalve mollusc in the family Sphaeriidae, the pea clams and fingernail clams.The adult size of the shell of this species is 3 mm.-Distribution:...
  
  Jenyns, 1832
• Pisidium pseudosphaerium
  Pisidium pseudosphaerium
  Pisidium pseudosphaerium is a species of freshwater bivalve from family Sphaeriidae.-Distribution:It's native distribution is central-European and western-European.* Czech Republic - in Bohemia, in Moravia, critically endangered...
  
  Favre, 1927

subgenus Pseudeupera Germain, 1909

• Pisidium pulchellum
  Pisidium pulchellum
  Pisidium pulchellum is a minute species of pea clam, a freshwater bivalve in the family Sphaeriidae.-Distribution and conservation status:* Not listed in IUCN red list - not evaluated...
  
  Jenyns, 1832
• Pisidium subtruncatum
  Pisidium subtruncatum
  Pisidium subtruncatum is a species of pill clam, a minute freshwater bivalve in the family Sphaeriidae.-Distribution:Its native distribution is Holarctic.* Czech Republic - in Bohemia, in Moravia, least concern...
  
  Malm, 1855

subgenus Neopisidium Odhner

Nils Hjalmar Odhner

Nils Hjalmar Odhner was a Swedish zoologist who studied mollusks, a malacologist. During his lifetime he was professor of invertebrate zoology at the Swedish Museum of Natural History, Stockholm...

, 1921

• Pisidium conventus
  Pisidium conventus
  Arctic-alpine Pea Clam, Pisidium conventus is a species of freshwater bivalve from family Sphaeriidae.-Distribution and conservation status:* Not listed in IUCN red list - not evaluated * Germany - endangered...
  
  Clessin, 1867

subgenus Odhneripisidium Kuiper, 1962

• Pisidium moitessierianum
  Pisidium moitessierianum
  Pisidium moitessierianum is a species of minute freshwater clam. It is an aquatic bivalve mollusc in the family Sphaeriidae.- Description :...
  
  Paladilhe, 1866
• Pisidium tenuilineatum
  Pisidium tenuilineatum
  Pisidium tenuilineatum, the fine-lined pea mussel, is a species of very small freshwater bivalve in the family Sphaeriidae.-Distribution:The species is native to Europe.* British Isles - listed in List of endangered species in the British Isles...
  
  Stelfox, 1918

subgenus Afropisidium Kuiper, 1962

• Pisidium giraudi Bourguignat, 1885
• Pisidium hodgkini
  Pisidium hodgkini
  Pisidium hodgkini is a freshwater bivalve of the family Sphaeriidae, which is found in New Zealand....
  
  (Suter
  Henry Suter
  Henry Suter was a New Zealand zoologist, naturalist, palaeontologist, and malacologist.- Biography :...
  
  , 1905)
• Pisidium pirothi Jickeli, 1881

subgenus ?

• Pisidium artifex
  Pisidium artifex
  Pisidium artifex is a species of freshwater bivalve in the Sphaeriidae family.It is endemic to Kenya. Its natural habitats are rivers, freshwater lakes, and freshwater marshes. It is threatened by habitat loss....
  
  Kuiper, 1960

subgenus Incertae sedis

Incertae sedis

, is a term used to define a taxonomic group where its broader relationships are unknown or undefined. Uncertainty at specific taxonomic levels is attributed by , , and similar terms.-Examples:*The fossil plant Paradinandra suecica could not be assigned to any...

• Pisidium annandalei Prashad, 1925
• Pisidium edlaueri Kuiper, 1960
• Pisidium maasseni Kuiper, 1987
• Pisidium punctiferum
  Pisidium punctiferum
  Pisidium punctiferum, common name Striate Peaclam, is a freshwater bivalve of the family Sphaeriidae.- Distribution :The type locality is a pond at Saint Ann's River, near Port of Spain, Trinidad. They were collected by the government botanist Mr. H...
  
  (Guppy, 1867)
• Pisidium raddei Dybowski, 1902
• undescribed Pisidium species from Africa (Kuiper, in prep., awaiting additional records)