The family Astacidae comprises the freshwater crayfish native to Europe and western North America. It is made up of three genera. Pacifastacus is found on the Pacific coast of the United States and British Columbia and includes the signal crayfish and the Shasta crayfish. The genera Astacus and Austropotamobius are both found throughout Europe and parts of western Asia. Species The family Astacidae contains 12 species in three genera :Astacus astacus — noble crayfishAstacus leptodactylus… (More on Astacidae)