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Arachnida (Arachnides)
Asteroidea (Starfish)
Bivalvia (Mussels)
River mussel (Unionida)
Oyster (Ostreida)
Ostreidae
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Oyster (Ostreida)
The order Ostreida includes the true oysters. One superfamily (Ostreoidea) and two extant families are recognised within it. The two families are Ostreidae, the true oysters, and Gryphaeidae, the foam oysters.
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