Red Diamond Rattlesnake 
Red-tailed bamboo pitviper 
Ridge-nosed Rattlesnake 
Russells viper 
Sabah Bamboo Pitviper 
Sahara Sand Viper 
Saw-scaled viper 
Schultze's Pit Viper 
Siamese peninsula pit viper 
Smith's Mountain Pit Viper 
Sonoran Desert Sidewinder 
South American Bushmaster 
Southern Pacific Rattlesnake 
Southwestern Speckled Rattlesnake 
Speckled forest-pitviper 
Spotted night adder 
Sri Lankan pit viper 
Sumatran Pit Viper 
Terciopelo 
Tiger Rattlesnake 
Timber rattlesnake 
Trimeresurus borneensis 
Trimeresurus sabahi fucatus 
Twin-spotted Rattlesnake