Viperidae

Crotalus pyrrhus (Cope, 1866)

Crotalus pyrrhus is a variable-colored rattlesnake found in rocky habitats of the southwestern US and northwestern Mexico.

Crotalus morulus Klauber, 1952

Crotalus morulus is an ovoviviparous rattlesnake species with fluorescent rattles and distinct dark blotched patterning.

Crotalus mitchellii (Cope, 1861)

Crotalus mitchellii, the speckled rattlesnake, is a small North American desert rattlesnake with variable camouflaged patterning.

Crotalus ehecatl Carbajal-Márquez, Cedeño-Vázquez, Martínez-Arce, Neri-Castro & Machkour-M'Rabet, 2020

Crotalus ehecatl is a large sexually dimorphic rattlesnake endemic to specific regions of Mexico.

Bothrops moojeni Hoge, 1966

Bothrops moojeni is a defensive viviparous viper found across central South America in forest and savanna habitats.

Bothrops asper (Garman, 1883)

Bothrops asper is a highly sexually dimorphic pit viper widespread across lowland to mid-elevation regions from eastern Mexico to northern South America.

Bothrops punctatus (Garcia, 1896)

Bothrops punctatus is a semiarboreal lance-headed pit viper found from Panama to northern Peru in moist and wet forests.

Bothrops atrox (Linnaeus, 1758)

Bothrops atrox, the common South American terrestrial pit viper, is a common non-endangered species that bears live young.

Bothrops jararacussu Lacerda, 1884

Bothrops jararacussu, the jararacussu, is a large venomous pit viper found in forests across eastern South America.

Bothrops leucurus Wagler, 1824

Bothrops leucurus is a terrestrial viviparous pit viper found along the Atlantic coast of eastern Brazil.

Bothrops marmoratus Da Silva & Rodrigues, 2008

Bothrops marmoratus, the marbled lancehead, is a nocturnal viviparous viper species found only in Goiás, Brazil.

Bothrops osbornei Freire-Lascano, 1991

Bothrops osbornei is a venomous viper species found in Ecuador and northwestern Peru.

Bothrops ammodytoides Leybold, 1873

Bothrops ammodytoides is a stout venomous pitviper found only in Argentina that may be the world's southernmost snake.

Bothrops diporus Cope, 1862

Bothrops diporus is an ovoviviparous sexually reproducing pit viper found along the Paraguay-Argentina border.

Bothrops alternatus Duméril, Bibron & Duméril, 1854

Bothrops alternatus is a highly venomous South American pit viper that is a major cause of snakebite across its range.

Bothrops neuwiedi Wagler, 1824

Bothrops neuwiedi is a South American pitviper with a defined scalation and color pattern, found in a range of forest and rocky dry habitats.

Bothrops jararaca (Wied-Neuwied, 1824)

Bothrops jararaca is a slender terrestrial venomous snake found in parts of South America, whose venom contributed to key medical drug developments.

Bothrops bilineatus (Wied-Neuwied, 1821)

Bothrops bilineatus is a small to medium South American viper with a green-based color pattern that lives in rainforest habitats near water, and is ovoviviparous.

Bothrops erythromelas Amaral, 1923

Bothrops erythromelas is a venomous pit viper species endemic to the Caatinga ecoregion of northeastern Brazil.

Bothrops pubescens (Cope, 1870)

Bothrops pubescens is a venomous viper found in Brazil and Uruguay that lives near forests and eats varied prey.

Bothrops taeniatus Wagler, 1824

Bothrops taeniatus is a slender arboreal South American pit viper with a complex color pattern and prehensile tail found in equatorial forests.

Bothrops mattogrossensis Amaral, 1925

Bothrops mattogrossensis is a species with distinct scale and body markings that reproduces sexually via ovoviviparity.

Cerrophidion godmani (Günther, 1863)

Cerrophidion godmani is a small terrestrial ovoviviparous pit viper found in high elevation forests and grasslands of southern Mexico and Guatemala.

Cerrophidion sasai Jadin, Townsend, Castoe & Campbell, 2012

Cerrophidion sasai, the Costa Rica montane pitviper, is a venomous diurnal snake found from southeastern Mexico to western Panama.