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Superfamily Astacoidea - Crayfishes

Adult Rusty Crayfish - Orconectes rusticus Crayfish - Orconectes propinquus Procambarus clarkii - male crayfish sp. - Orconectes virilis Unknown Crustacean - Cambarus Crayfish - Procambarus Procambarus alleni?? - female Crayfish - Procambarus clarkii
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 (Crayfishes)
Other Common Names
Mudbugs
Explanation of Names
Astacoidea Latreille, 1802
Numbers
Two families in North America: Cambaridae, which is widespread, and Astacidae, of which one genus (Pacifastacus) is found in the Pacific Northwest and the headwaters of some rivers east of the Continental Divide.
Identification
If you want a crayfish sexed or ID'ed to species, it is most helpful to have a good ventral view of the abdomen so that the pleopods (swimmerets) are clearly visible.

Tips for IDs from Photo: What to Photograph
1) Dorsal view of full carapace
2) Rostrum and Acumen
3) Areola
4) Dorsal view of Chelae ("claws")
5) Gonopods - As mentioned above, the first set of pleopods are modified in males as the sex organs known as gonopods, and rest against the abdomen between the last set of legs. A good up-close photo of the gonopods can be critical for an ID of many different species. If at all possible, gently left the left gonopod away from the abdomen with a tooth pick and photo both lateral and mesial views with a macro capable camera or lens.
Print References
Hobbs, Jr., Horton H. 1989. An Illustrated Checklist of the American Crayfishes (Decapoda: Astacidae, Cambaridae, and Parastacidae). Smithsonian Contributions to Zoology, no. 480. iii + 236.