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Related to Astacidae: Parastacidae, Cambaridae
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A checklist of the North and Middle American crayfishes (Decapoda: Astacidae and Cambaridae).
Two families, Astacidae and Cambaridae, are native to North America and include about 408 species and subspecies, representing about 77% of the global species diversity in North America (Taylor 2002).
The North American crayfish belong to two families, Astacidae and Cambaridae with all members east of the Mississippi River belong to the family Cambaridae (Hobbs 1974a).
The cambarid crayfish differ from the Astacidae of western North America and Europe by the presence of hooks on the ischia of the second through fourth pereiopods and dimorphic cycling in males (Hobbs 1974).