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Agkistrodon bilineatus bilineatus Agkistrodon howardgloydi Agkistrodon taylori Agkistrodon piscivorus Agkistrodon contortrix Sistrurus catenatus Sistrurus miliarius Crotalus pricei Crotalus intermedius Crotalus horridus Porthidium yucatanicum Bothrops moojeni
0 3.00 6 9 12 Time (MYA)
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