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

Families genera and species within the order Unionoida are found on six continents. There are approximately 900 species.

Families in the Order Unionoida

• Etheriidae Swainson, 1840
• Margaritiferidae Haas, 1940
• Mutelidae Swainson, 1840
• Unionidae Fleming, 1828
• Hyriidae Swainson, 1840
• Mycetopodidae Gray, 1840

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