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Procambarus
''Procambarus'' is a genus of crayfish in the family Cambaridae, all native to North and Central America. It includes a number of troglobitic species, and the parthenogenetic marmorkrebs. Originally described as a subgenus for four species, it now contains 160 species in 16 subgenera.
==Biogeography==
The majority of the diversity is found in the southeastern United States, but the genus extends as far south as Belize and Guatemala, and as far east as Cuba. Subgenus ''Ortmannicus'' is the most widespread, with the range of ''Procambarus acutus'' extending as far north as the Great Lakes and New England, as well as south into northeastern Mexico; the subgenus ''Girardella'' also extends from the Great Lakes to Mexico, but is distributed further west than ''Ortmannicus''.〔 ''Scapulicambarus'' and ''Pennides'' are widespread in the southeastern United States, where ''Remoticambarus'' also lives, further west (Texas and Louisiana) than ''Leconticambarus'' which is centered on Florida and neighboring states. The subgenus ''Austrocambarus'' has the most southerly distribution, being found in Cuba and parts of Central America from Mexico to Belize. The other subgenera are more restricted in their distributions, including three endemic to central Mexico, and six endemic to small areas in the United States.〔〔
Many species of ''Procambarus'' have been introduced to other continents, where they are frequently categorized as invasive species.
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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