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Faxonius virilis
Image courtesy of © Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology via the Encyclopedia of Life CC BY-NC-SA 3.0 License
Faxonius virilis
Taxonomic Group: Crustaceans-Crayfish


Orconectes virilis, the Virile Crayfish, is a freshwater crayfish that can tolerate brackish water salinities up to at least 14 PSU. It is native to the Great Lakes, the southern Arctic Ocean, and northern Mississippi drainages from northern Arkansas, Mississippi, and Tennessee to Alberta and southeastern Quebec, with populations extending west in the Mississippi drainage to Montana and Colorado. It has been introduced into at least nine states and the District of Columbia, including California, Washington, Arizona, Pennsylvania, New Jersey, Maryland, Virginia, West Virginia, and North Carolina. It has also been found in New Brunswick, Mexico, England, and the Netherlands. In some parts of its introduced range, O. virilis has been reported to displace native crayfish species.

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Fofonoff PW, Ruiz GM, Steves B, Simkanin C, & Carlton JT (2018)
National Exotic Marine and Estuarine Species Information System.
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