Unionoida
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Unionoida is an order within the class Bivalvia. Members of the order Unionoida, which includes the mussels, are found on six continents. There are approximately 900 species.
[edit] Families in the Order Unionoida
- Etheriidae Swainson, 1840
- Margaritiferidae Haas, 1940
- Mutelidae Swainson, 1840
- Unionidae Fleming, 1828
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