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Unionida

Animal
Unionida is a monophyletic order of freshwater mussels, aquatic bivalve molluscs. The order includes most of the larger freshwater mussels, including the freshwater pearl mussels. The most common families are the Unionidae and the... Wikipedia
Scientific name: Unionida
Order: Unionida; Stoliczka, 1871
Higher classification: Palaeoheterodonta
Rank: Order
Lower classifications