Faxonius virilis

Faxonius virilis is a species of crayfish known as the virile crayfish, northern crayfish, eastern crayfish, and lesser known as the lake crayfish or common crawfish. Faxonius virilis was reclassified in August 2017, and the genus was changed from Orconectes to Faxonius.[2] It is native to eastern United States and southeast Canada.

Faxonius virilis
Adult
Adult
Scientific classification edit
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Family: Cambaridae
Genus: Faxonius
Species:
F. virilis
Binomial name
Faxonius virilis
(Hagen, 1870) [1]
Synonyms[2]
  • Cambarus virilis Hagen, 1870
  • Cambarus wisconsinensis Bundy in Forbes, 1876
  • Cambarus debilis Bundy in Forbes, 1876
  • Cambarus couesi Streets, 1877

Ecology

Faxonius virilis can be found under stones and logs in lakes, streams, and wetlands, where they hide from predators, such as fish. They are identified by the brown of rust-red carapace and large chelipeds, which are usually blue in colour. Faxonius virilis feeds on a wide range of plants and invertebrates, as well as tadpoles and even small fish.

Distribution
Juvenile's greenish colour will turn red on the carapace and blue on the claws with age

Faxonius virilis is found in southern Canada from Alberta to Quebec and in the northern United States, but has become an invasive species in parts of North America outside its native range, and was discovered in the United Kingdom in 2008.[3] It is listed as a species of Least Concern on the IUCN Red List.[4]

Invasiveness status

In Europe, Faxonius virilis is included since 2016 in the list of Invasive Alien Species of Union concern (the Union list).[5] This implies that this species cannot be imported, bred, transported, commercialized, or intentionally released into the environment in the whole of the European Union.[6]

Uses

Faxonius virilis is used as fishing bait and as food for humans, and also as aquarium food for carnivorous fish.[7]

References
  1. "Faxonius virilis". Integrated Taxonomic Information System. Retrieved October 20, 2010.
  2. Keith A Crandall & Sammy De Grave (2017). "An updated classification of the freshwater crayfishes (Decapoda: Astacidea) of the world, with a complete species list". Journal of Crustacean Biology. 37 (5): 615–653. doi:10.1093/jcbiol/rux070.
  3. Daniel Ahern; Judy England & Adam Ellis (2008). "The virile crayfish, Orconectes virilis (Hagen, 1870) (Crustacea: Decapoda: Cambaridae), identified in the UK". Aquatic Invasions. 3 (1): 102–104. doi:10.3391/ai.2008.3.1.18.
  4. S. Adams; G. A. Schuster & C. A. Taylor (2010). "Orconectes virilis". IUCN Red List of Threatened Species. 2010: e.T153831A4551026. doi:10.2305/IUCN.UK.2010-3.RLTS.T153831A4551026.en.
  5. "List of Invasive Alien Species of Union concern - Environment - European Commission". ec.europa.eu. Retrieved 2021-07-27.
  6. "REGULATION (EU) No 1143/2014 of the European parliament and of the council of 22 October 2014 on the prevention and management of the introduction and spread of invasive alien species".{{cite web}}: CS1 maint: url-status (link)
  7. Krista Kagume (2008). Ontario Nature Guide. Edmonton: Lone Pine Publishing. ISBN 978-1-55105-564-0.
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