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bivalve
Anomalosesmata Cryptodonta Heterodonta Paleoheterodonta Palaeotaxodonta Pteriomorphia
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Trivia about bivalve
A mollusk, like an oyster or clam, with a shell consisting of 2 hinged parts
Meaning 2-shelled, the name of this New Jersey town goes back to its oyster industry days
(Jimmy of the Clue Crew presents the clue.) The shell of tridacna squamosa, or fluted giant clam, shows why is is classed as one of these, from the Latin for "two folding doors"