The Most Dangerous Venomous Snakes: Central and South America Page 1 of 7 The six most important venomous snakes in Central and South America at a glance! Lanceheads and rattlesnakes are some of the most venomous snakes in these regions. Check out the most dangerous venomous snakes in Central and South America South American Rattlesnake - Photo: Susan Schmitz/Shutterstock Table of Contents: Fer-de-Lance Mexican West Coast Rattlesnake South American Rattlesnake Golden Lancehead Common Lancehead Bushmaster 1234