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  • "Originally: of, relating to, or resembling bivalve molluscs of a type represented by the nut shell Nucula. In later use: spec. of, relating to, or designating protobranch bivalve molluscs of the order Nuculoida, which includes mainly deposit-feeding species attested in the fossil record from the Ordovician period onwards, and often regarded as among the most primitive extant bivalves." (OED)

    September 8, 2008