Pisidium casertanum
Encyclopedia
Pisidium casertanum, the pea cockle or pea clam, is a minute freshwater bivalve
mollusc of the family
Sphaeriidae
.
but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally.
Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm.
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Freshwater bivalve
Freshwater bivalves are one kind of freshwater molluscs. They are bivalves which live in freshwater, as opposed to saltwater. Although the majority of species of bivalve molluscs live in the sea, a number of different families of bivalves live in freshwater...
mollusc of 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...
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Description
The shell is of similar shape to Sphaerium novaezelandiaeSphaerium novaezelandiae
Sphaerium novaezelandiae is a very small freshwater clam, an aquatic bivalve mollusc in the family Sphaeriidae, sometimes known as the fingernail clams.-References:...
but is smaller as an adult, more inflated, with a deeper hinge-plate, stronger teeth, and the ligament is not visible externally.
Length is up to 4.5 mm, height 3.7 mm, and thickness 2.3 mm.
Distribution
It has a cosmopolitan distributionCosmopolitan distribution
In biogeography, a taxon is said to have a cosmopolitan distribution if its range extends across all or most of the world in appropriate habitats. For instance, the killer whale has a cosmopolitan distribution, extending over most of the world's oceans. Other examples include humans, the lichen...
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- British Isles - common
- Czech Republic - in Bohemia, in Moravia, least concern (LC)
- Germany - distributed in whole Germany. High endangered (Stark gefährdet) in HesseHesseHesse or Hessia is both a cultural region of Germany and the name of an individual German state.* The cultural region of Hesse includes both the State of Hesse and the area known as Rhenish Hesse in the neighbouring Rhineland-Palatinate state...
, critically endangered (vom Aussterben bedroht) in SaxonySaxonyThe Free State of Saxony is a landlocked state of Germany, contingent with Brandenburg, Saxony Anhalt, Thuringia, Bavaria, the Czech Republic and Poland. It is the tenth-largest German state in area, with of Germany's sixteen states....
. Pisidium casertanum ponderosum endangered (gefährdet) in BrandenburgBrandenburgBrandenburg is one of the sixteen federal-states of Germany. It lies in the east of the country and is one of the new federal states that were re-created in 1990 upon the reunification of the former West Germany and East Germany. The capital is Potsdam...
. - Latvia
- Netherlands
- New Zealand - common
- Poland
- Slovakia
