Ophidia
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Ophidia is a group of squamate reptiles including modern snakes and reptiles more closely related to snakes than to other living groups of lizards.
Coast Garter Snake
Fossil of Archaeophis proavus.
Toxicofera
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Toxicofera is a clade of scaled reptiles that includes the Serpentes, Anguimorpha and Iguania. Toxicofera contains about 4,600 species of extant Squamata. It encompasses all venomous reptile species,
Ophidia
…possible placements for the clade, including as stem squamates (in which case they would have convergently evolved their snake-like anatomy) or as early toxicoferans outside of Ophidia. Based on comparative anatomy, there is consensus that snakes descended from lizards. Pythons and boas—primitive groups among modern…
Mexican ridged nosed rattlesnake head