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Infraorder Astacidea - Crayfishes and Lobsters

O. virilis  - Orconectes virilis Northern crayfish - Orconectes virilis Orconectes erichsonianus - female crayfish sp. - Orconectes virilis Crawdad - Cambarus bartonii white river crayfish - Procambarus acutus - male Procambarus acutus? crawfish - male
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)
Numbers
freshwater crayfish: worldwide ~670 spp. in 5 families grouped in 2 superfamilies(1)