Crotalus

(krōt′ăl-ŭs )

[L. crotalum, fr. Gr. krotalon, rattle, castanet]
A genus of venomous snakes of the family Crotalidae that includes most rattlesnakes.

Crotalus atrox

SEE: diamondback rattlesnake

Crotalus helleri

The Southern Pacific rattlesnake (a pit viper whose range is the southwestern US). Its venom contains a potent nerve toxin.