Family
Margaritiferidae
Margaritifera falcata. Photo: (c) fishwrangler, some rights reserved (CC BY-NC)
Margaritiferidae is a family of medium-sized freshwater mussels, aquatic bivalve molluscs in the order Unionoida. They are known as freshwater pearl mussels, because the interior of the shell of these species has a thick layer of nacre or mother of pearl, and the mussels are thus capable of producing pearls.
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