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)
Crotalinae (subfamily)
Agkistrodon (genus)
Agkistrodon contortrix (species)
[hide inferior taxa]
Agkistrodon contortrix contortrix (subspecies)
Agkistrodon contortrix laticinctus (subspecies)
Agkistrodon contortrix mokasen (subspecies)
Agkistrodon contortrix phaeogaster (subspecies)
Agkistrodon contortrix pictigaster (subspecies)