Arkansas has an amazing diversity of plants and animals contained within its political boundaries. Forty-seven taxa are reported as Arkansas endemics, including seven plants, thirteen crustaceans (two amphipods, three isopods, eight crayfishes), nine insects (one mayfly, one caddisfly, three stoneflies, four beetles), ten snails, six fishes, and two salamanders.
Robison, Henry W. and Smith, Kenneth L.
"Endemic Flora and Fauna of Arkansas,"
Journal of the Arkansas Academy of Science: Vol. 36
, Article 17.
Available at: http://scholarworks.uark.edu/jaas/vol36/iss1/17