Viperidae
Dusky Rattlesnake
Crotalus triseriatus Wagler, 1830
Crotalus triseriatus is a small Mexican rattlesnake found in highland habitats of the Transverse Volcanic Cordillera.
Red Diamond Rattlesnake
Crotalus ruber Cope, 1892
Crotalus ruber (red diamond rattlesnake) is a moderately large reddish rattlesnake found in northwestern Mexico and southwestern California.
Twin-spotted Rattlesnake
Crotalus pricei Van Denburgh, 1895
Crotalus pricei is a small rattlesnake found in southeastern Arizona and northern Mexico, with distinct paired dorsal blotches.
Panamint Rattlesnake
Crotalus stephensi Klauber, 1930
Crotalus stephensi is a rattlesnake species native to mid-elevation desert mountains of California and Nevada.
Rock Rattlesnake
Crotalus lepidus Kennicott, 1861
Crotalus lepidus Kennicott, 1861 is a small ovoviviparous rattlesnake found in the southwestern US and northern central Mexico.
Mexican Smallhead Rattlesnake
Crotalus intermedius Troschel, 1865
Crotalus intermedius is a small rattlesnake found in central and southern Mexico at 2000–3200 m elevation.
Timber Rattlesnake
Crotalus horridus Linnaeus, 1758
Crotalus horridus, the timber rattlesnake, is a venomous snake native to eastern US deciduous forests.
Lower California Rattlesnake
Crotalus enyo Cope, 1861
Crotalus enyo is a small-headed rattlesnake found in Baja California and surrounding Gulf islands with varied arid habitats.
Sidewinder
Crotalus cerastes Hallowell, 1854
Crotalus cerastes, or sidewinder/horned rattlesnake, is a small desert viper with characteristic supraocular eye horns.
Cross-banded Mountain Rattlesnake
Crotalus transversus Taylor, 1944
Crotalus transversus Taylor, 1944 is a rattlesnake found only in high-elevation temperate boreal forests of central Mexico.
Tiger Rattlesnake
Crotalus tigris Kennicott, 1859
Crotalus tigris (tiger rattlesnake) is a small rattlesnake native to the southwestern US and northwestern Mexico.
Mexican Lancehead Rattlesnake
Crotalus polystictus (Cope, 1865)
Crotalus polystictus is a venomous rattlesnake found on the central Mexican plateau at mid-to-high elevations.
Western Diamond-backed Rattlesnake
Crotalus atrox Baird & Girard, 1853
Crotalus atrox, the western diamondback rattlesnake, is a large North American venomous pit viper with a characteristic diamond-patterned body.
Western Rattlesnake
Crotalus oreganus Holbrook, 1840
Crotalus oreganus is a North American rattlesnake with variable size, coloration, and well-documented life history traits.
Eastern Diamondback Rattlesnake
Crotalus adamanteus Palisot De Beauvois, 1799
This is the eastern diamondback rattlesnake, the largest rattlesnake species native to the southeastern United States.
Queretaran Dusky Rattlesnake
Crotalus aquilus Klauber, 1952
Crotalus aquilus is a small, heavy-bodied rattlesnake found in highland habitats of central Mexico.
Basilisk Rattlesnake
Crotalus basiliscus (Cope, 1864)
Crotalus basiliscus is a large rattlesnake species native to the western Mexican coastal plain.
Mexican Pygmy Rattlesnake
Crotalus ravus Cope, 1865
Crotalus ravus is a moderately stout rattlesnake found only in temperate high elevations across central and southern Mexico.
Prairie Rattlesnake
Crotalus viridis Rafinesque, 1818
Crotalus viridis (prairie rattlesnake) is a North American rattlesnake with specific traits and viviparous reproduction.
Central American Rattlesnake
Crotalus simus Latreille, 1801
Crotalus simus is a rattlesnake species found from Mexico to Colombia with documented traditional medicinal use by Maya people.
Eastern Black-tailed Rattlesnake
Crotalus ornatus Hallowell, 1854
Crotalus ornatus is a medium-sized black-tailed rattlesnake native to the southwestern US and Mexico.
Campbell's Rattlesnake
Crotalus campbelli Bryson Jr, Linkem, Dorcas, Lathrop, Jones, Alvarado-Díaz, Grünwald & Murphy, 2014
Crotalus campbelli is a 2014-described Mexican rattlesnake found in rocky montane areas of western Mexico.
Western Black-tailed Rattlesnake
Crotalus molossus Baird & Girard, 1853
Crotalus molossus, the black-tailed rattlesnake, is a medium-sized venomous rattlesnake found in the southwestern US and Mexico.
Mexican Dusky Rattlesnake
Crotalus armstrongi Campbell, 1979
Crotalus armstrongi, the western dusky rattlesnake, is a small venomous pit viper endemic to Mexico with no recognized subspecies.
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