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snakes rather than more primitive lineages. Below is a cladogram modified from a study by Wilson et al. (2010), which found many stem-snakes of other studies to be true snakes instead.

Below is different phylogenetic overview of ophidians, following the study by Caldwell et al. 2015.

The fossil record of snakes is relatively poor because snake skeletons are typically small and fragile, making fossilization uncommon. Fossils readily

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