Sistrurus tergeminus

Sistrurus tergeminus


Taxonavigation: Viperoidea 

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Cladus: Unidentata, Episquamata
Cladus: Toxicofera
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Viperoidea

Familia: Viperidae
Subfamilia: Crotalinae
Genus: Sistrurus
Species: Sistrurus tergeminus


Sistrurus tergeminus (Say, 1823) [conserved name]

  • Type material: not designated.
  • Type locality: “between Mississippi River and the Rocky Mountains”, restricted to “Winfield, Cowley County, Kansas” by Smith & Taylor (1950: 358).
  • Placed on the Official List of Specific Names in Zoology by Opinion 2328 (2013).


  • Crotalus tergeminus Say, 1823: 499 [original combination]


Primary referencesEdit

  • International Commission on Zoological Nomenclature. 2013. Opinion 2328 (Case 3571). Crotalinus catenatus Rafinesque, 1818 (currently Sistrurus catenatus) and Crotalus tergeminus Say in James, 1822 (currently Sistrurus tergeminus; Reptilia, Serpentes): usage conserved by designation of neotypes for both species. Bulletin of Zoological Nomenclature 70(4): 282–283. DOI: 10.21805/bzn.v70i4.a13   Reference page


Vernacular namesEdit

English: Western Massasauga