Sphaeriidae
Encyclopedia
The Sphaeriidae are a 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...

 of small to minute freshwater bivalve molluscs, in the order
Order (biology)
In scientific classification used in biology, the order is# a taxonomic rank used in the classification of organisms. Other well-known ranks are life, domain, kingdom, phylum, class, family, genus, and species, with order fitting in between class and family...

 Veneroida
Veneroida
The Veneroida or veneroids are an order of bivalve molluscs. They include some familiar forms such as saltwater clams and cockles, and a number of freshwater bivalves including zebra mussels....

. In the USA they are commonly known as the pea clams and the fingernail clams.

Genera

Genera in the family Sphaeriidae include:
  • Musculium
    Musculium
    Musculium is a genus of small freshwater clams, aquatic bivalve mollusks in the family Sphaeriidae, the fingernail clams and pea clams.-Species:Species and subgenera within this genera include:Subgenus Musculium Link, 1807...

  • Pisidium
    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.-Subgenera and species:Subgenera and species within the genus Pisidium include:...

  • Sphaerium
    Sphaerium
    Sphaerium is a genus of very small freshwater clams, aquatic bivalve mollusks in the family Sphaeriidae, known as the fingernail clams....

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