Sphaeriidae is a family of small to minute freshwater bivalve molluscs in the order Sphaeriida. In the US, they are commonly known as pea clams or fingernail...

produce a single large egg at a time. The family used to be known as "Sphaeriidae", but the name was preoccupied by a family of freshwater clams. The name...

molluscs in the family Sphaeriidae, the pea clams and fingernail clams. In some bivalve classification systems, the family Sphaeriidae is referred to as Pisidiidae...

Margaritiferidae Mycetopodidae Unionidae Veneroida Cardiidae Corbiculidae Sphaeriidae Dreissenidae Solenidae Donacidae Navavulidae Myoida Corbulidae Erodonidae...

very small freshwater clam, an aquatic bivalve mollusk in the family Sphaeriidae, the fingernail clams. The shell is fairly globular and can grow up to...

minute freshwater clam. It is an aquatic bivalve mollusc in the family Sphaeriidae. This species is the smallest of the pea clams or Pisidium species, and...

tiny Heleobia spp.) and less than half a dozen bivalves (all in family Sphaeriidae), but in general these are very poorly known and their taxonomy is in...

Sphaerium nucleus is a freshwater bivalve of the family Sphaeriidae. It has been often confused with Sphaerium corneum and is consequently quite poorly...

minute freshwater clam. It is an aquatic bivalve mollusc in the family Sphaeriidae, the fingernail clams and pea clams. This minute clam, which is known...

about half of these, all in the families Euglesidae, Pisidiidae, and Sphaeriidae, are endemic (the only other family in the lake is the Unionidae with...