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Organism

  Animalia

      Chordata

            Reptilia

                    Squamata

                            Viperidae

                                     Agkistrodon

                                             Agkistrodon bilineatus

                                             Agkistrodon howardgloydi

                                     Atropoides

                                             Atropoides mexicanus

                                                   [Atropoides nummifer]

                                                   [Bothrops mexicanus]

                                                   [Bothrops nummifer]

                                                   [Bothrops nummifera]

                                             Atropoides picadoi

                                     Bothriechis

                                             Bothriechis lateralis

                                                   [Bothrops lateralis]

                                             Bothriechis marchi

                                                   [Bothrops marchi]

                                             Bothriechis nigroviridis

                                                   [Bothrops nigroviridis]

                                             Bothriechis nubestris

                                             Bothriechis schlegelii

                                                   [Bothrops nigroadspersus]

                                                   [Bothrops schlegeli]

                                                   [Bothrops schlegelii]

                                                   [Trimeresurus schlegelii]

                                             Bothriechis supraciliaris

                                     Bothriopsis

                                             Bothriopsis punctata

                                     Bothrops

                                             Bothrops asper

                                             Bothrops atrox

                                                   [Lachesis atrox]

                                             Bothrops punctatus

                                     Cerrophidion

                                             Cerrophidion godmani

                                                   [Bothrops godmani]

                                                   [Trimeresurus godmani]

                                             Cerrophidion sasai

                              Crotalinae

                                     Metlapilcoatlus

                                             Metlapilcoatlus mexicanus

                                     Crotalus

                                             Crotalus durissus

                                             Crotalus simus

                                     Lachesis

                                             Lachesis achrocorda

                                             Lachesis acrochorda

                                             Lachesis melanocephala

                                             Lachesis muta

                                             Lachesis mutus

                                             Lachesis stenophrys

                                     Porthidium

                                             Porthidium lansbergii

                                                   [Bothrops lansbergi]

                                                   [Bothrops lansbergii]

                                             Porthidium nasutum

                                                   [Bothrops brachystoma]

                                                   [Bothrops nasuta]

                                                   [Bothrops nasutus]

                                                   [Lachesis brachystoma]

                                                   [Trimeresurus nasutus]

                                             Porthidium ophryomegas

                                                   [Bothrops ophryomegas]

                                                   [Trimeresurus lansbergii]

                                             Porthidium porrasi

                                             Porthidium volcanicum

                                     Trimeresurus