Children (10 direct children, 697 direct and indirect children):
Crotalinae
(tree size 476)
Pit adders
Viperinae
(tree size 190)
Viridovipera
(tree size 5)
Cryptelytrops
(tree size 9)
Azemiopinae
(tree size 3)
Fea viper
Zhaoermia
(tree size 1)
Laophis
(tree size 1)
Causus
Himalayophis
(tree size 1)
Trimersurus
(tree size 1)