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Agkistrodon contortrix Agkistrodon piscivorus Sistrurus catenatus Sistrurus miliarius Crotalus basiliscus Crotalus totonacus Crotalus molossus Crotalus tigris Crotalus adamanteus Crotalus oreganus helleri Crotalus cerberus Crotalus viridis Crotalus mitchellii Crotalus atrox Crotalus horridus Crotalus cerastes Crotalus lepidus
0 4.64 9 14 19 Time (MYA)
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