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1 Tree was published in this study

When continents collide: phylogeny, historical biogeography and systematics of the medically important viper genus Echis (Squamata: Serpentes: Viperidae).
Pook, Joger, Stümpel, Wüster. (2009). Mol Phylogenet Evol.
Echis Cerastes cerastes Macrovipera lebetina Montivipera xanthina Vipera berus Vipera ammodytes Daboia Eristicophis macmahoni Causus rhombeatus Atheris nitschei Proatheris superciliaris Bitis peringueyi Bitis nasicornis Bitis arietans Sistrurus catenatus Sistrurus miliarius Crotalus durissus Agkistrodon piscivorus Bothriechis nigroviridis Bothrops asper Bothrocophias hyoprora Porthidium lansbergii rozei Porthidium arcosae Porthidium nasutum Porthidium ophryomegas Cerrophidion godmani Ovophis okinavensis Calloselasma rhodostoma Deinagkistrodon acutus Protobothrops sieversorum Trimeresurus borneensis Trimeresurus macrops Azemiops feae Naja mossambica Naja ashei Naja nigricollis Naja katiensis Naja nubiae Naja pallida Naja arabica Naja haje haje Naja annulifera Naja nivea Naja naja Naja kaouthia Bungarus fasciatus Ophiophagus hannah Mimophis mahfalensis Psammophis condanarus Malpolon monspessulanus Leioheterodon madagascariensis Boaedon fuliginosus Cerberus rynchops Borikenophis portoricensis Heterodon Farancia abacura Diadophis punctatus Contia tenuis Coronella girondica Elaphe sauromates Hemorrhois hippocrepis Hemorrhois algirus Hemorrhois nummifer Eirenis modestus Macroprotodon brevis Lycodon semicarinatus Natrix natrix Acrochordus granulatus
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