What shape is the hard, calcified shell of the Zebra Mussel (Dreissena polymorpha)?
Answer
D-shaped
The shell structure of the zebra mussel is characterized by two hinged valves made of hard calcium carbonate. While descriptions acknowledge some variability, the overall shape is predominantly described as D-shaped. Some sources also note that it can be categorized as triangular, but D-shaped is the most immediately recognizable description for this bivalve.
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