Scolecophidians
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This evolutionary group of snakes contains the primitive non-burrowers, a limited radiation of species contained in the families Typhlopidae and Typhlopidae, though sometimes other burrowing families are included in this group. All scolecophidians retain the vestiges of a pelvic girdle. It is uncertain whether they are a more primitive group than the Henophidians, or simply highly adapted to their burrowing lifestyle.