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(phylum Mollusca, class Bivalvia)

An order of mainly equivalve bivalves which have true heterodont dentition, an opisthodetic ligament, and an isomyarian musculature. Most are vagile or nestling. The shells are commonly ornamented with concentric ribbing. Veneroida first appeared in the Middle Ordovician.

Subjects: Zoology and Animal Sciences.

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