The Field Guide to Crayfishes of the Midwest is the most up-to-date reference available for the identification of crayfishes found in aquatic habitats across the midwestern states of Minnesota, Wisconsin, Iowa, northern Missouri, Illinois, Indiana, Michigan, and Ohio. The field guide also includes: distribution maps; a dichotomous and illustrated identification key for both shrimps and crayfishes; general information on crayfish biology, conservation, and collecting techniques; and species-specific information on habitat, key identification features, and conservation notes for all species found in this region.