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)
Crotalus (genus)
Crotalus viridis (species)
western rattlesnake (primary common name)
[hide inferior taxa]
Crotalus viridis cereberus (subspecies)
Crotalus viridis concolor (subspecies)
Crotalus viridis helleri (subspecies)
Crotalus viridis lutosus (subspecies)
Crotalus viridis viridis (subspecies)