
Sacculina is a genus of barnacles that is a parasitic castrator of crabs. The adults bear no resemblance to the barnacles that cover ships and piers; they are recognised as barnacles because their larval forms are like other members of the barnacle class Cirripedia. Depending on the location, the prevalence of this unusual crustacean parasite in i...
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http://en.wikipedia.org/wiki/Sacculina

(from the article `barnacle`) Parasitic cirripedes of the order Rhizocephala, such as Sacculina, lack appendages, shell, and gut and resemble fungi. They parasitize decapod ... Some barnacles are parasitic and have undergone a radical degeneration in form. One, Sacculina, is an example of the way in which the reproductive ... [2 rela...
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http://www.britannica.com/eb/a-z/s/3
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