Ophryacus (Cope, 1887)
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. Currently two species are recognized and no subspecies.
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.
Restricted to the mountains of central and southern Mexico.
T) Type species.
* List of crotaline species and subspecies
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).
* O'Shea, M. 2005. Venomous Snakes of the World. Princeton University Press. ISBN 0-691-12436-1.
Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License