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David Lindberg, PhD
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Phylum Mollusca Class Bivalvia Number of families 105
Bilaterally symmetrical mollusks, with a reduced head and typically two external shell valves, many of which are commercially important for human consumption and pearl production; some have major impacts on the world economy and environment
Photo: A coquina clam (Donax variabilis) underwater, with its siphons extended. (Photo by Harry Rogers/Photo Researchers, Inc. Reproduced by permission.)
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