Copperhead & Cottonmouth Agkistrodon   Palisot de Beauvois, 1799

Taxonomic Comments:

Wüster, Wolfgang, Lindsay Peppin, Catharine E. Pook & Daniel E. Walker (2008. A nesting of vipers: Phylogeny and historical biogeography of the Viperidae. Molecular Phylogenetics and Evolution. 49: 445-459) provided robust evidence for recognition of the Family Crotalidae as an entity distinct from the Family Viperidae.