| 词条 | Porthidium | ||||||||||||||||||||||||||||||||||||||||||||||||||
| 释义 |
| name = Porthidium | image = Porthidium nasutum banino.jpg | image_caption = Porthidium nasutum, rainforest hognose pitviper | taxon = Porthidium | authority = Cope, 1871[1] }} Common names: hognose pitvipers.[2] Porthidium is a genus of venomous pitvipers found in Mexico and southward to northern South America.[1] The name is derived from the Greek word portheo and the suffix -idus, which mean "destroy" and "having the nature of", apparently a reference to the venom.[2] As of August 2016 nine species are recognized as being valid.[3] The snakes of the genus Hypnale in southern India and Sri Lanka look quite similar to those of this genus, possibly an example of convergent evolution. DescriptionPorthidium is a genus of small species, adults ranging in total length (including tail) from {{convert|55|cm|in|abbr=on}} (P. dunni and P. yucatanicum) to {{convert|75|cm|in|abbr=on}} (P. lansbergii and P. ophryomegas). In addition, the body shape ranges from relatively slender (P. ophryomegas) to relatively stout (P. nasutum). All have a sharply defined canthus rostralis and a rostral scale that is higher than it is broad. The tip of the snout may be slightly to moderately elevated (P. hespere, P. lansbergii, P. ophryomegas and P. volcanicum), strongly elevated (P. dunni and P. yucatanicum), or not elevated at all.[2]All species have a color pattern that usually consists of a brown or gray ground color, overlaid with a series of dark paraventral blotches that are separated by a pale and narrow vertebral stripe. The blotches are square, rectangular, or triangular in shape. In some species, the color pattern is determined by the sex.[2] Geographic rangeFound in Mexico (Colima, Oaxaca and Chiapas on the Pacific side, the Yucatán Peninsula on the Atlantic side) southward through Central America to northern South America (Ecuador in the Pacific lowlands, northern Venezuela in the Atlantic lowlands).[1] Species
T) Type species.[1] Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Porthidium. See also
References1. ^1 2 3 4 McDiarmid RW, Campbell JA, Touré TA (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. {{ISBN|1-893777-00-6}} (series). {{ISBN|1-893777-01-4}} (volume). 2. ^1 2 3 4 Campbell JA, Lamar WW (2004). The Venomous Reptiles of the Western Hemisphere Ithaca and London: Comstock Publishing Associates. 870 pp., 1500 plates. {{ISBN|0-8014-4141-2}}. 3. ^1 2 3 {{ITIS |id=585667 |taxon=Porthidium |accessdate=4 November 2006}} 4. ^1 2 3 4 "Porthidium ". The Reptile Database. www.reptile-database.org. Further reading
External links{{Commons|Porthidium}}
2 : Porthidium|Taxa named by Edward Drinker Cope |
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