Serpentes
Scolecophidia
Leptotyphlopidae
Typhlopoidea
Gerrhopilidae
Xenotyphlopidae
Typhlopidae
Anomalepididae
Alethinophidia
Amerophidia
Aniliidae
Tropidophiidae
Afrophidia
Uropeltoidea
Anomochilidae
Cylindrophiidae
Uropeltidae
Constrictores
Bolyeriidae
Xenophidiidae
Booidea
Calabariidae
Sanziniidae
Boidae
Candoiidae
Erycidae
Charinaidae
Ungaliophiidae
Pythonoidea
Xenopeltidae
Loxocemidae
Pythonidae
Caenophidia