Pisidium
Pisidium is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams.
| Pisidium | |
|---|---|
| External view of the left valve of Pisidium pseudosphaerium | |
| Scientific classification | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Sphaeriida |
| Superfamily: | Sphaerioidea |
| Family: | Sphaeriidae |
| Genus: | Pisidium C. Pfeiffer, 1821 |
| Species | |
|
See text | |
| Synonyms | |
|
Tetragonocyclas Pirogov & Starobogatov, 1974 | |
In some bivalve classification systems, the family Sphaeriidae is referred to as Pisidiidae, and occasionally Pisidium species are grouped in a subfamily known as Pisidiinae.
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