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Viperidae (Family) - vipers and pit vipers ..[Atractaspinae] (Subfamily) ..[Azemiophinae] (Subfamily) - Fea vipers ..Azemiopinae (Subfamily) ..[Cenchris] (Genus) ..Crotalinae (Subfamily) - pit vipers ..[Sinovipera] (Genus) ..Viperinae (Subfamily) - pitless vipers ..[Causinae] (Subfamily) - night adders

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Last updated: 28 Aug 2026