Squamata Oppel 1811 [Gauthier, Estes & de Queiroz 1988], nom. cl. inval. see Order Squamata Oppel, 1811
   Episquamata Vidal & Hedges, 2005
     Toxicofera Vidal & Hedges, 2005
       Serpentes see Suborder Serpentes Linnaeus, 1758
         Family Viperidae Oppel, 1811 - vipers and pit vipers
           Subfamily Crotalinae Oppel, 1811 - pit vipers
             Genus Gloydius Hoge & Romano-Hoge, 1981