A taxonomic superfamily.
The Superfamily Unionacea is further organized into finer groupings including:
Hyriidae is a family of pearly freshwater mussels in the order Unionoida native to South America, Australia, New Zealand and New Guinea. Like all members of that order, they go through a larval stage that is parasitic on fish. The classification recognized by Banarescu (1990) uses three subfamilies. This family contains eighteen genera. [more]
Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve mollusks in the order Unionoida. They are known as freshwater pearl mussels, because they are capable of producing pearls. [more]
Unionidae is a family of freshwater mussels, the largest in the order Unionoida, the bivalve mollusks sometimes known as river mussels, naiads, or simply as unionids. [more]
At least 1,431 species and subspecies belong to the Family Unionidae.
More info about the Family Unionidae may be found here.
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