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Marmorkrebs
ドイツ語:Marmorkrebs, or marbled crayfish, are parthenogenetic crayfish that were discovered in the pet trade in Germany in the 1990s. ''Procambarus fallax'' forma ''virginalis'' is an informal subspecies designation for marmorkrebs, and some researchers have proposed a new species designation, ''Procambarus virginalis''. Marmorkrebs are closely related to the "slough crayfish", ''Procambarus fallax''.〔 ''P. fallax'' is widely distributed across Florida, but no natural populations of marmorkrebs are known. Information provided by one of the original pet traders as to where the marmorkrebs originated was deemed "totally confusing and unreliable". ''Marmorkrebs'' is German for "marbled crayfish".
==Model organism==
Marmorkrebs are the only known decapod crustaceans to reproduce only by parthenogenesis.〔 All individuals are female, and the offspring are genetically identical to the parent. Marmorkrebs are triploid animals , which may be the main reason for their parthenogenetic reproduction. Marmorkrebs are thus a model for the rapid generation of species .
Because marmorkrebs are genetically identical, easy to care for, and reproduce at high rates, they are a potential model organism, particularly for studying development. A major drawback, however, is the long generation time (several months) compared to other research organisms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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