Serpentes see Suborder Serpentes Linnaeus, 1758 Alethinophidia Nopcsa, 1923 see Infraorder Alethinophidia Nopcsa, 1923 Caenophidia Hoffstetter, 1939 Colubroidea Oppel, 1811 Family Viperidae Oppel, 1811 - vipers and pit vipers Subfamily Crotalinae Oppel, 1811 - pit vipers