Colubridae

Colubridae
Temporal range: Oligocene to Recent
Caspian whipsnake, Coluber caspius
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Subphylum: Vertebrata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Infraorder: Alethinophidia
Family: Colubridae
Oppel, 1811

The Colubridae (from Latin coluber, snake) are a family of snakes. With 304 genera and 1,938 species, Colubridae is the largest snake family, and includes about two-thirds of all known living snake species. The earliest species of the family date back to the Oligocene epoch. Colubrid species are found on every continent except Antarctica.[1]

Description

While most colubrids are not venomous (or have venom that is not known to be harmful to humans) and are mostly harmless, a few groups, such as genus Boiga, can produce medically significant bites, while the boomslang, the twig snakes, and the Asian genus Rhabdophis have caused human fatalities.[1][2] The Colubridae also include the few species of actually poisonous snakes, notably Rhabdophis tigrinus, the Japanese grass snake or yamakagashi, the difference between poisonous and venomous being that venom requires direct administration (i.e. intravenous injection) and poison can be administered indirectly (i.e. skin contact or ingestion).

Some of the colubrids are described as opisthoglyphous, meaning they have elongated, grooved teeth located in the back of the upper jaw. The opisthoglyphous dentition appears at least twice in the history of snakes.[2] These are unlike those of vipers and elapids, which are located in the front.[1][2]

Classification

The Colubridae as traditionally defined are not a natural group, as many are more closely related to other groups, such as elapids, than to each other.[3] This family has classically been a "garbage bin taxon" for snakes that do not fit elsewhere.[4] Additional research will be necessary to sort out the relations within this group.

Subfamily Boodontinae (some of which now treated as subfamily Grayiinae of the new Colubridae, others moved to family Lamprophiidae as subfamilies Lamprophiinae and Pseudaspidinae)

Subfamily Calamariinae

Subfamily Colubrinae – nearly 100 genera

Subfamily Dipsadinae (which some authors rank as family Dipsadidae with subfamilies Dipsadinae and Xenodontinae)

Subfamily Homalopsinae (now family Homalopsidae) – about 10 genera

Subfamily Natricinae (which some authors rank as family Natricidae) - about 30 genera

Subfamily Pareatinae (now family Pareatidae) - three genera

Subfamily Psammophiinae (now a subfamily of Lamprophiidae)

Subfamily Pseudoxenodontinae (which some authors rank as family Pseudoxenodontidae)

Subfamily Pseudoxyrhophiinae (now a subfamily of Lamprophiidae) – about 20 genera

Subfamily Xenoderminae (now family Xenodermidae, sometimes incorrectly spelled Xenodermatidae)

Subfamily Xenodontinae (which some authors put in the new Dipsadidae family) – some 55–60 genera

incertae sedis

References

  1. 1 2 3 Bauer, Aaron M. (1998). Cogger, H.G. & Zweifel, R.G., ed. Encyclopedia of Reptiles and Amphibians. San Diego: Academic Press. pp. 188–195. ISBN 0-12-178560-2.
  2. 1 2 3 Bruna Azara C (1995). "Animales venenosos. Vertebrados terrestres venenosos peligrosos para el ser humano en España". Bol. SEA 11: 32–40.
  3. ↑ Lawson, R; Slowinski, J.B.; Crother, B.I.; Burbrink, F.T. (2005). "Phylogeny of the Colubroidea (Serpentes): New evidence from mitochondrial and nuclear genes" (PDF). Molecular Phylogenetics and Evolution 37: 581–601. doi:10.1016/j.ympev.2005.07.016. PMID 16172004.
  4. ↑ Fry, B.G.; Vidal, N.; van der Weerd, L.; Kochva, E.; Renjifo, C. (2009). "Evolution and diversification of the Toxicofera reptile venom system". Journal of Proteomics 72: 127–136. doi:10.1016/j.jprot.2009.01.009. PMID 19457354.

External links

Wikimedia Commons has media related to Colubridae.
This article is issued from Wikipedia - version of the Monday, April 18, 2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.