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The Caenophidia are a derived clade of alethinophidian snakes, which contains over 80% of all the extant species of snakes. [1] The largest family is Colubridae, but it also includes at least seven other families, [1] at least four of which were once classified as "Colubridae" before molecular phylogenetics helped us understand their relationships.
Historically, snake venom was believed to have evolved once, at the base of the Caenophidia, or derived snakes. Molecular studies published beginning in 2006 suggested that venom originated just once among a putative clade of reptiles, called Toxicofera , approximately 170 million years ago. [ 7 ]
Afrophidia is a clade of alethinophidian snakes comprising the groups Henophidia and Caenophidia, essentially making up the snakes people commonly associate with.
Henophidia is a former superfamily of the suborder Serpentes that contains boas, pythons and numerous other less-well-known snakes. [1]Snakes once considered to belong to superfamily Henophidia include two families now considered Amerophidia (Aniliidae – red pipe snakes, and Tropidophiidae – dwarf "boas" or thunder snakes), three families now considered Uropeltoidea (Cylindrophiidae ...
There is a third family containing the opistoglyphous (rear-fanged) snakes (as well as the majority of other snake species): Colubrids – boomslangs, tree snakes, vine snakes, cat snakes, although not all colubrids are venomous. [26]: 209 [83]
Family medicine [note 1] is a medical specialty within primary care that provides continuing and comprehensive health care for the individual and family across all ...
The western diamondback rattlesnake [3] or Texas diamond-back [4] (Crotalus atrox) is a rattlesnake species and member of the viper family, found in the southwestern United States and Mexico. Like all other rattlesnakes and all other vipers, it is venomous .
A family nurse practitioner (FNP) provides continuing and comprehensive healthcare for the individual and family across all ages, genders, diseases, and body systems. Primary care emphasizes the holistic nature of health and it is based on knowledge of the patient in the context of the family and the community, emphasizing disease prevention ...