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Sistrurus tergeminus

Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
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 references

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 Paywall Reference page.


Uetz, P. & Hallermann, J. 2022. Sistrurus tergeminus. The Reptile Database. Accessed on 22 October 2019.

Vernacular names
English: Western Massasauga


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