the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Chordata (phylum)
Craniata (subphylum)
Vertebrata (no rank)
Gnathostomata (superclass)
Sarcopterygii (class)
Tetrapoda (no rank)
Amniota (no rank)
Sauropsida (no rank)
Sauria (no rank)
Lepidosauria (superorder)
Squamata (order)
Serpentes (suborder)
Colubroidea (superfamily)
Viperidae (family)
Viperinae (subfamily)
viper (common name)
vipers (common name)
[hide inferior taxa]
Bitis (genus)
Callosellasma rhodostoma (species)
Cerastes (genus)
Daboia russellii (species)
Echis (genus)
Eristocophis macmahoni (species)
Macrovipera lebetina (species)
Pseudocerastes (genus)
Vipera (genus)