A family of snakes comprising four subfamilies: Azemiopinae (the mountain viper, the sole member of this subfamily), Viperinae (true vipers), Crotalinae (pit vipers) and Causinae. They are widespread throughout the world, being found in the United States, Central and South America, Europe, Asia and Africa. Their venoms act on the blood (hemotoxic) as compared to the venom of elapids which act on the nervous system (neurotoxic). (Goin, Goin, and Zug, Introduction to Herpetology, 3d ed, pp333-36)

Descriptor ID	D017819
MeSH Number(s)	B01.050.150.900.833.672.125.937
Concept/Terms	Viperidae Viperidae Bushmaster Bushmaster Bushmasters Cerastes Cerastes European Viper European Viper European Vipers Viper, European Vipers, European Asp Asps European Adder Adder, European Adders, European European Adders Gaboon Viper Gaboon Viper Gaboon Vipers Viper, Gaboon Vipers, Gaboon Viperinae Viperinae True Vipers True Viper Viper, True Vipers, True Lachesis Lachesis Bitis Bitis Azemiopinae Azemiopinae

Below are MeSH descriptors whose meaning is more general than "Viperidae".

Below are MeSH descriptors whose meaning is related to "Viperidae".

Below are MeSH descriptors whose meaning is more specific than "Viperidae".