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Nephropidae (lobsters; class Malacostraca, order Decapoda) Family of lobsters, which have large chelipeds and are similar in form to crayfish. Males are generally much larger than females. The family include Nephrops norvegicus (Dublin Bay prawn, Norway lobster, scampo) which lives off Atlantic and Mediterranean shores at depths of 40–80 m, usually on soft, sandy substrates.