| Mixcoatlus melanurus | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Viperidae |
| Genus: | Mixcoatlus |
| Species: | M. melanurus |
| Binomial name | |
| Mixcoatlus melanurus (L. Müller, 1924) | |
| Synonyms [2] | |
| |
Mixcoatlus melanurus is a venomous pitviper species endemic to the mountains of southern Mexico. No subspecies are currently recognized. [4] [5]
Adults grow to between 37.5 and 50 centimetres (14+3⁄4 and 19+5⁄8 inches) in length and have a moderately stout build. [3] In Mexico, it is called a necazcoatl, from the Nahualt words necaztli and coatl which means "eared-serpent" referring to its "horns".
It is found in two Mexican states, southern Puebla and Oaxaca, at elevations of 1,600–2,400 m (5,200–7,900 ft). The type locality given is "Mexico". [2]
This species is classified as Endangered (EN) on the IUCN Red List of Threatened Species with the following criteria: B1ab(iii) (v3.1, 2001). [1] A species is listed as such when the best available evidence indicates that the geographic range, in the form of extent of occurrence, is estimated to be less than 5,000 km2 (1,900 sq mi), that estimates indicate it to be severely fragmented or known to exist at no more than 5 locations, and that a continuing decline has been observed, inferred or projected, in area, extent and/or quality of habitat. It is therefore considered to be facing a very high risk of extinction in the wild. In 2007 when it was last assessed, the population trend was down. [6]
Terrestrial. [3]
Crotalus intermedius is a pit viper species found in central and southern Mexico. Like all other pit vipers, it is venomous. Three subspecies are currently recognized, including the nominate subspecies described here.
Crotalus pusillus is a venomous pit viper species found in west-central Mexico. No subspecies are currently recognized.
Crotalus stejnegeri, commonly known as the Sinaloan long-tailed rattlesnake or just long-tailed rattlesnake, is a venomous pit viper species in the family Viperidae. The species is native to western Mexico. There are no recognized subspecies.
Crotalus transversus is a venomous pit viper species found in central Mexico, known from less than 20 specimens. No subspecies are currently recognized.
Exiliboa is a monotypic genus created for the non-venomous dwarf boa species Exiliboa placata, which is endemic to southern Mexico. No subspecies are currently recognized.
Crotalus angelensis, or the Ángel de la Guarda Island speckled rattlesnake, is a pitviper species endemic to Isla Ángel de la Guarda in the Gulf of California, Mexico. Like all other pitvipers, it is venomous. It is sometimes treated as a subspecies of Crotalus mitchellii.
Crotalus lorenzoensis is a species of pitviper, a venomous snake in the subfamily Crotalinae of the family Viperidae. The species is endemic to San Lorenzo Sur Island, Mexico.
Crotalus mitchellii muertensis is a venomous pitviper subspecies endemic to El Muerto Island, Mexico. It is sometimes treated as a full species, Crotalus muertensis.
Metlapilcoatlus nummifer, commonly known as Mexican jumping pitviper or jumping viper, is a venomous pit viper species endemic to Mexico.
Metlapilcoatlus olmec is a venomous pitviper species found in Mexico. No subspecies are currently recognized.
Bothriechis aurifer is a venomous pit viper species found in Mexico and Guatemala. No subspecies are currently recognized.
Bothriechis rowleyi is a species of pit viper, a venomous snake, in the subfamily Crotalinae of the family Viperidae. The species is endemic to Mexico. There are no subspecies that are recognized as being valid.
Mixcoatlus barbouri is a venomous pit viper species endemic to Mexico. No subspecies are currently recognized.
Cerrophidion tzotzilorum is a venomous pit viper species which is native to southern Mexico. There are no subspecies that are recognized as being valid.
Porthidium hespere is a venomous pitviper species found in western Mexico. No subspecies are currently recognized.
Porthidium nasutum is a venomous pitviper species found in southern Mexico, Central America and northern South America. No subspecies are currently recognized.
Porthidium yucatanicum is a venomous pitviper species found in Mexico. No subspecies are currently recognized.
Ophryacus undulatus is a venomous pitviper species found in the mountains of central and southern Mexico. No subspecies are currently recognized.
Metlapilcoatlus mexicanus is a venomous pitviper species endemic to Mexico and Central America.
Metlapilcoatlus occiduus is a venomous pitviper subspecies endemic to southern Mexico, Guatemala, and El Salvador.
