Kingdom Animalia Subclass Pteriomorphia Higher classification Pteriomorphia Length Pacific oyster: 8 – 40 cm | Phylum Mollusca Scientific name Ostreoida Rank Order | |
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Clutch size Pacific oyster: 50,000,000 – 200,000,000 Lower classifications Ostreidae, Ostrea, Crassostrea, Pectinidae, Anomiidae |
The order Ostreoida includes the true oysters. One superfamily and two families are recognised within it. The two families are Ostreidae, the true oysters, and Gryphaeidae, the foam oysters.

2010 taxonomy

In 2010, a new proposed classification system for the Bivalvia was published by Bieler, Carter & Coan, revising the classification of the Bivalvia, including the order Ostreoida.
References
Ostreoida Wikipedia(Text) CC BY-SA