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Genus Orconectes

Propinquus - Orconectes propinquus - female Propinquus - Orconectes propinquus - female Crayfish - Orconectes Crayfish - Orconectes virilis crayfish sp. - Orconectes virilis - female crawfish sp. - Orconectes virilis - male crayfish in creek - Orconectes rusticus spinycheek crayfish - Orconectes limosus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Crustacea (Crustaceans)
Class Malacostraca (Malacostracans)
Superorder Eucarida (Eucarida (Crabs, Crayfish, Shrimp, etc.))
Order Decapoda (Crabs, Crayfishes, Lobsters, Prawns, and Shrimp)
Infraorder Astacidea (Crayfishes and Lobsters)
Superfamily Astacoidea (Crayfish)
Family Cambaridae
Genus Orconectes
Internet References

'The Propinquus Group of the Crawfish Genus Orconectes', J.F. Fitzpatrick, Jr.; (The Ohio Journal of Science, Vol. 67, No. 3, May 1967)