Mixcoatlus browni
Mixcoatlus browni is a species of pit viper found at high elevations in Guerrero, Mexico. This species was previously placed in the genus Agkistrodon, where it was considered to be a junior synonym of Cerrophidion barbouri. Molecular evidence has since demonstrated that M. browni is a distinct species and the genus name was subsequently changed.
The genus Mixcoatlus is derived from the Nahuatl word Mixcoatl or "cloud serpent", a deity of the Aztec and several other Mesoamerica civilizations. This name also refers to the geographic restriction of this clade to elevations above.