A class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts.
BIVALVIA (MUSSELS OR OYSTERS) | instanceof | MUSSELS |
BIVALVIA (MUSSELS OR OYSTERS) | instanceof | OYSTERS |
MUSSELS | isa | BIVALVIA (MUSSELS OR OYSTERS) |
OYSTERS | isa | BIVALVIA (MUSSELS OR OYSTERS) |
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