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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
Superfamiliae: Acrochordoidea - Colubroidea - Elapoidea - Homalopsoidea - Pareatoidea - Viperoidea - Xenodermatoidea


* Vidal, N.; Delmas, A.-S.; David, P.; Cruaud, C.; Couloux, A.; Hedges, S.B. 2007: The phylogeny and classification of caenophidian snakes inferred from seven nuclear protein-coding genes. C.R. Biologies, 330: 182–187. PDF

Xenophidia (Caenophidia) is a superfamily of the suborder Serpentes (snakes) that contains cobras, vipers, sea snakes and the majority of snake species. Almost all venomous snakes belong to this superfamily. Additionally, the broad belly scales and rows of dorsal scales correspond to the vertebrae in Caenophidians, while they do not in Henophidians or Scolecophidians.

Caenophidia contains most of the diversity of extant snakes, with over 3,000 species. They are believed to be a recent evolutionary radiation, having evolved in the mid-Cenozoic.


* Atractaspididae (mole vipers).
* Colubridae (rear-fanged snakes).
* Elapidae (cobras, mambas, coral snakes and kraits).
* Hydrophiidae (sea snakes).
* Viperidae (vipers, pit vipers and rattlesnakes).

Biology Encyclopedia

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