Among species of the genus Pisidium the shell appear to resemble most " Cyclas argentina"
2.
Stelfox was a recognised authority on Hymenoptera and on non-marine Mollusca especially the genus " Pisidium ".
3.
Some of the pea clams ( " Pisidium " species ) have an adult size of only 3 mm.
4.
The umbones are not so prominent as those of " Pisidium calyculata ", but they are occasionally flattened or otherwise distorted.
5.
The Ouki lake was populated by species such as " Pisidium " bivalves, ostracodes and the " Biomphalaria andecola " snail.
6.
These include both an unidentified fragmentary lymnaeid ( a freshwater snail ), and an unidentified true " Pisidium " ( a freshwater bivalve ).
7.
""'Pisidium henslowanum " "'is a species of very small freshwater clam or pea clam, an aquatic bivalve mollusc in the family Sphaeriidae.
8.
""'Pisidium supinum " "'is a species of minute freshwater clam, a pea clam, an aquatic bivalve mollusc in the family Sphaeriidae ( the fingernail clams and pea clams .)
9.
""'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.
10.
There are 4 locally extinct species in the Netherlands : the marine gastropod " Rissoa membranacea ", land gastropod " Spermodea lamellata ", and freshwater bivalves " Unio crassus " and " Pisidium tenuilineatum ".
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