reptile genus - a genus of reptiles

Crotalidae, family Crotalidae - New World vipers: pit vipers

Agkistrodon contortrix, copperhead - common coppery brown pit viper of upland eastern United States

Agkistrodon piscivorus, cottonmouth, cottonmouth moccasin, water moccasin - venomous semiaquatic snake of swamps in southern United States