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)
Vipera (genus)
[hide inferior taxa]
Vipera ammodytes (species)
Vipera aspis (species)
Vipera berus (species)
Vipera lebetina (species)
Vipera nikolskii (species)
Vipera palaestinae (species)
Vipera russelli (species)
Vipera sp. (species)