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Sacculina carcini

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Sacculina carcini, the crab hacker barnacle, is a species of parasitic barnacle in the family Sacculinidae, in particular a parasitic castrator, of crabs. The crab that most often is used as a host is the green crab, the natural range of which is the coasts of Europe and North Africa. It can be found attached to the crab's abdomen and affects consumption rates by humans.