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Poisonous animals
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North America
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Mixcoatlus spp., Montane pitvipers

Clinical entries

For clinical data see section “Risk” below


  • 1. Mixcoatlus barbouri
  • 2. Mixcoatlus browni
  • 3. Mixcoatlus melanurus


The genus Mixcoatlus has been proposed by Jadin et al. 2011.

M. barbouri and M. browni formerly Cerrophidion barbouri. M. melanurus formerly Ohpryacus melanurum.


Serpentes; Viperidae; Crotalinae

Common names

  • 1. Barbour's montane pitviper
  • 2. Brown's montane pitviper
  • 3. Black tailed horned pitviper


Southern Mexico. See link "Distribution" at the top of the page for detailed information.


Relatively small and stout pitvipers, reaching a maximum length of 50 cm. M. barbouri and M. browni are diurnal.

Although M. browni posses a prehensile tail it does not live high in the trees, but ascends into low vegetation. In M. melanurus a single scale above each eye forms a flattened horn.

The limited habitat range of Mixcoatl spp. makes this genus the most retricted of New World pitvipers. The three species live in altitudes above 1'600 m. M. barbouri in humid pine-oak and cloud forest, 2'300–2'600 m. M. browni in cloud forest, 1'800-3'300 m. M. melanurus in arid tropical scrub, deciduous forest and seasonally dry pine-oak forest, 1'600-2'400 m.




Literature (biological)

Jadin et al. 2011, Grünwald et al. 2015