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Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Reptilia
Subclassis: Diapsida
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Subordo: Serpentes
Infraordo: Caenophidia
Superfamilia: Viperoidea
Familia: Viperidae
Subfamilia: Crotalinae
Genus: Ophryacus
Species: O. melanurus - O. undulatus -


Ophryacus (Cope, 1887)

Vernacular names
English: Mexican Pit Vipers

Ophryacus is a genus of venomous pitvipers endemic to Mexico. The name is derived from the Greek words ophrys and the suffix -acutus, which means "brow" and "belonging to"; an allusion to the characteristic hornlike scales over the eyes.[2] Currently two species are recognized and no subspecies.[3]


The larger of the two species, O. undulatus, grows to between 55 and 70 cm in length. They are characterized by the presence of a single scale over they eye that takes the shape of either a long and relatively slender spine, or a flattened horn. Often, other supraocular scales are also shaped in such a way that they project slightly.[2]

Geographic range

Restricted to the mountains of central and southern Mexico.[1]


Species[3] Taxon author[3] Common name[2] Geographic range[1]
O. melanurus (Müller, 1924) Black-tailed horned pitviper The mountains of southern Mexico (southern Puebla and Oaxaca at elevations of 1600-2400 m.
O. undulatusT (Jan, 1859) Mexican horned pitviper The mountains of central and southern Mexico (Hidalgo, Veracruz, Oaxaca and Guerrero) west of the Isthmus of Tehuantepec at elevations of 1800-2800 m.

T) Type species.[1]

See also

* List of crotaline species and subspecies
* Crotalinae by common name
* Crotalinae by taxonomic synonyms
* Snakebite


1. ^ a b c d McDiarmid RW, Campbell JA, Touré T. 1999. Snake Species of the World: A Taxonomic and Geographic Reference, vol. 1. Herpetologists' League. 511 pp. ISBN 1-893777-00-6 (series). ISBN 1-893777-01-4 (volume).
2. ^ a b c d Campbell JA, Lamar WW. 2004. The Venomous Reptiles of the Western Hemisphere. Comstock Publishing Associates, Ithaca and London. 870 pp. 1500 plates. ISBN 0-8014-4141-2.
3. ^ a b c "Ophryacus". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=585665. Retrieved 4 November 2006.

Further reading

* O'Shea, M. 2005. Venomous Snakes of the World. Princeton University Press. ISBN 0-691-12436-1.

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Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License