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Anodonta anatina
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Subclass: Palaeoheterodonta
Order: Unionoida
Stoliczka, 1871

See text.

Unionoida is an order of freshwater mussels, aquatic bivalve mollusks. The order includes most of the larger freshwater mussels, including the freshwater pearl mussels. All have in common a larval stage that is temporarily parasitic on fish, nacreous shells, high in organic matter, that may crack upon drying out, and siphons too short to permit the animal to live deeply buried in sediment.

Families, genera, and species are found on six continents, where they are restricted exclusively to freshwater. Many face conservation issues due to habitat degradation or over-exploitation for their shell. There are approximately 900 species worldwide.

Families in the Order Unionoida


Up to date as of January 23, 2010

From Wikispecies


Main Page
Cladus: Eukaryota
Supergroup: Unikonta
Cladus: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Bivalvia
Subclassis: Paleoheterodonta
Ordo: Unionoida
Superfamiliae: Etherioidea - Unionoidea - Incertae sedis

Genera incertae sedis: Germainaia


Unionoida Stoliczka, 1871


Unionoida Report on ITIS


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