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Marmorkrebs, or marbled crayfish, are parthenogenetic crayfish that were discovered in the pet trade in Germany in the 1990s.[2] Marmorkrebs are closely related to the "slough crayfish", Procambarus fallax.[3] Procambarus fallax is widely distributed across Florida,[4] but there are no known natural populations of Marmorkrebs. Information provided by one of the original pet traders as to where they got Marmorkrebs was deemed "totally confusing and unreliable".
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Marmorkrebs are the only known decapod crustaceans to reproduce by parthenogenesis.[2] All individuals are female, and the offspring are genetically identical to the parent.
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http://en.wikipedia.org/wiki/Marmorkrebs