Sphaerium is a genus of very small freshwater clams, aquatic bivalve molluscs in the family Sphaeriidae, known as the fingernail clams. The small clams in this genus are unusual in that many of them, such as Sphaerium corneum, can climb around underwater on aquatic plants, using their long and strong foot.
| Sphaerium | |
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| Sphaerium corneum | |
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| Live Sphaerium sp. moving around with its foot. Collected from a pond in Portland, Oregon | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Sphaeriida |
| Superfamily: | Sphaerioidea |
| Family: | Sphaeriidae |
| Genus: | Sphaerium Scopoli, 1777 |
| Species | |
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See text. | |
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