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Ophryacus undulatus Mixcoatlus melanurus Lachesis stenophrys Lachesis muta Agkistrodon contortrix Agkistrodon piscivorus Crotalus atrox Crotalus ruber Sistrurus catenatus Bothriechis schlegelii Bothriechis supraciliaris Bothriechis thalassinus Bothriechis marchi Bothriechis rowleyi Bothriechis aurifer Bothriechis bicolor Bothriechis lateralis Bothriechis nigroviridis Atropoides olmec Atropoides nummifer Atropoides occiduus Atropoides picadoi Cerrophidion tzotzilorum Cerrophidion petlalcalensis Cerrophidion godmani Porthidium porrasi Bothrops asper Ovophis monticola
0 4.00 8 12 16 Time (MYA)
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