Taxonomy
Mainly there are five venomous snake families:
Family: Viperidae
- SubFamily: Azemiopinae
- SubFamily: Crotalinae (pit vipers)
- Agkistrodon
- Atropoides
- Bothriechis
- Bothrocophias
- Bothropoides
- Bothrops
- Bothrops alcatraz
- Bothrops alternatus (urutu)
- Bothrops ammodytoides (Yararanata)
- Bothrops asper (terciopelo)
- Bothrops atrox (barba amarilla)
- Bothrops barnetti (Barnett's lancehead)
- Bothrops bilineata (green jararaca)
- Bothrops brazili
- Bothrops caribbaeus
- Bothrops chloromelas
- Bothrops colombiensis
- Bothrops cotiara (cotiara)
- Bothrops fonsecai (Fonseca's lancehead)
- Bothrops insularis (golden lancehead)
- Bothrops isabelae
- Bothrops itapetiningae (Sao Paulo lancehead)
- Bothrops jararaca (jararaca)
- Bothrops jararacussu (jararacussu)
- Bothrops lanceolatus
- Bothrops leucurus
- Bothrops lojanus (Lojan lancehead)
- Bothrops marajoensis
- Bothrops moojeni (Brazilian lancehead)
- Bothrops neuwiedi group
- Bothrops oligolepis
- Bothrops osbornei
- Bothrops pictus
- Bothrops pirajai
- Bothrops pleuroxanthus
- Bothrops pulchra
- Bothrops punctatus
- Bothrops taeniata (speckled forest pit viper)
- Bothrops sp. EAC-2016a
- Calloselasma
- Cerrophidion
- Crotalus
- Crotalus adamanteus (eastern diamondback rattlesnake)
- Crotalus aquilus
- Crotalus armstrongi (Mexican dusky rattlesnake)
- Crotalus atrox (western diamondback rattlesnake)
- Crotalus basiliscus
- Crotalus catalinensis
- Crotalus cerastes
- Crotalus cerberus (Arizona black rattlesnake)
- Crotalus culminatus
- Crotalus durissus (tropical rattlesnake)
- Crotalus enyo
- Crotalus ericsmithi (Guerreran long-tailed rattlesnake)
- Crotalus horridus (timber rattlesnake)
- Crotalus intermedius
- Crotalus lannomi (Autlan long-tailed rattlesnake)
- Crotalus lepidus (rock rattlesnake)
- Crotalus lepidus x aquilus
- Crotalus mitchellii (speckled rattlesnake)
- Crotalus molossus (blacktail rattlesnake)
- Crotalus oreganus
- Crotalus polystictus
- Crotalus pricei
- Crotalus pusillus
- Crotalus ravus (Mexican pygmy rattlesnake)
- Crotalus ruber (red diamond rattlesnake)
- Crotalus scutulatus (Mojave rattlesnake)
- Crotalus scutulatus x viridis
- Crotalus simus
- Crotalus stejnegeri (Sinaloan long-tailed rattlesnake)
- Crotalus stephensi (Panamint rattlesnake)
- Crotalus tancitarensis
- Crotalus tigris
- Crotalus tortugensis
- Crotalus totonacus
- Crotalus transversus
- Crotalus triseriatus
- Crotalus tzabcan (Yucatan neotropical rattlesnake)
- Crotalus viridis (western rattlesnake)
- Crotalus willardi
- Crotalus sp. AAL-2011
- Deinagkistrodon
- Garthius
- Gloydius
- Gloydius blomhoffii (mamushi)
- Gloydius brevicaudus (short-tailed mamushi)
- Gloydius halys (halys viper)
- Gloydius intermedius (Central Asian pitviper)
- Gloydius lijianlii
- Gloydius liupanensis
- Gloydius monticola (Likiang pitviper)
- Gloydius saxatilis
- Gloydius shedaoensis (Shedao Island pitviper)
- Gloydius strauchi (Strauch's pitviper)
- Gloydius tsushimaensis (Tsushima island pitviper)
- Gloydius ussuriensis (Ussuri mamushi)
- Gloydius sp. 1 SH-2014
- Gloydius sp. 2 SH-2014
- Gloydius sp. 3 SH-2014
- Gloydius sp. 4 SH-2014
- Gloydius sp. ES-2015
- Hypnale
- Lachesis
- Mixcoatlus
- Ovophis
- Parias
- Popeia
- Porthidium
- Protobothrops
- Protobothrops cornutus
- Protobothrops cf. cornutus
- Protobothrops dabieshanensis
- Protobothrops elegans (sakishima habu)
- Protobothrops flavoviridis (habu)
- Protobothrops himalayanus
- Protobothrops jerdonii
- Protobothrops kaulbacki
- Protobothrops mangshanensis
- Protobothrops maolanensis (Mao-lan pitviper)
- Protobothrops mucrosquamatus (Chinese habu)
- Protobothrops sieversorum (Three horned-scaled pitviper)
- Protobothrops tokarensis (Tokara Habu)
- Protobothrops trungkhanhensis (Trungkhanh pitviper)
- Protobothrops xiangchengensis
- Sistrurus
- Trimeresurus
- Trimeresurus albolabris (white-lipped tree viper)
- Trimeresurus andersonii (Anderson's pitviper)
- Trimeresurus borneensis
- Trimeresurus buniana
- Trimeresurus cantori (Cantor' pit viper)
- Trimeresurus cardamomensis (Cardamom Mountains green pitviper)
- Trimeresurus erythrurus
- Trimeresurus erythrus/purpureomaculatus
- Trimeresurus fasciatus (banded pit viper)
- Trimeresurus flavomaculatus (Philippine pitviper)
- Trimeresurus fucatus
- Trimeresurus gracilis
- Trimeresurus gramineus (Indian green tree viper)
- Trimeresurus gumprechti (Gumprechts green pitviper)
- Trimeresurus hageni (Indonesian pit viper)
- Trimeresurus honsonensis
- Trimeresurus insularis (White-lipped island pitviper)
- Trimeresurus kanburiensis (Kanburi pit viper)
- Trimeresurus macrops (Kramer's pit viper)
- Trimeresurus malabaricus
- Trimeresurus malcolmi (Malcom's pitviper)
- Trimeresurus mcgregori (McGregor's pitviper)
- Trimeresurus medoensis (green bamboo leaf pit viper)
- Trimeresurus nebularis
- Trimeresurus popeiorum (Pope's bamboo pit viper)
- Trimeresurus puniceus
- Trimeresurus purpureomaculatus (shore pit viper)
- Trimeresurus rubeus (ruby-eyed green pitviper)
- Trimeresurus sabahi (Sabah bamboo pitviper)
- Trimeresurus schultzei (Schultze's pit viper)
- Trimeresurus septentrionalis (Nepal pitviper)
- Trimeresurus sichuanensis (Sichuan pitviper)
- Trimeresurus stejnegeri (Stejneger's pit viper)
- Trimeresurus sumatranus (Sumatra pit viper)
- Trimeresurus tibetanus (Tibetan pit viper)
- Trimeresurus trigonocephalus
- Trimeresurus truongsonensis
- Trimeresurus venustus (beautiful pitviper)
- Trimeresurus vogeli (Vogel's pit viper)
- Trimeresurus wiroti
- Trimeresurus yunnanensis (Yunnan bamboo pitviper)
- Trimeresurus sp. 1 AL-2012
- Tropidolaemus
- Triceratolepidophis
- SubFamily: Viperinae (vipers)
- Atheris
- Bitis
- Causus
- Cerastes
- Daboia
- Echis
- Eristicophis
- Macrovipera
- Montivipera
- Montivipera albicornuta (Iranian mountain viper)
- Montivipera albizona
- Montivipera bornmuelleri
- Montivipera bulgardaghica
- Montivipera kuhrangica
- Montivipera latifii (Latifi's viper)
- Montivipera raddei (Caucasus viper)
- Montivipera wagneri (Wagner's viper)
- Montivipera xanthina (coastal viper)
- Montivipera sp. HO-2015
- Montivipera sp. NSt-2016a
- Proatheris
- Pseudocerastes
- Vipera
- Vipera ammodytes (sand viper)
- Vipera anatolica
- Vipera aspis (aspic viper)
- Vipera barani
- Vipera berus (adder)
- Vipera dinniki (Dinnik's viper)
- Vipera eriwanensis
- Vipera kaznakovi
- Vipera latastei
- Vipera lotievi
- Vipera monticola (mountain viper)
- Vipera nikolskii
- Vipera orlovi
- Vipera renardi (steppe viper)
- Vipera seoanei
- Vipera transcaucasiana
- Vipera ursinii