Parent taxon: Alethinophidia according to N. Vidal and S. B. Hedges 2002
See also Carroll 1988, Kuhn 1966 and Rage et al. 2008
Sister taxa: Acrochordoidea, Afrotortrix, Aniliidae, Anilioidea, Caenophidia, Cerberophis, Colombophis, Colubroidea, Cylindrophiidae, Itaboraiophis, Macrostomata, Paulacoutophis, Pseudoxyrhophiidae, Simoliopheoidea, Tuscahomaophis
Subtaxa: Bolyeriidae Calabariidae Coprophis Helagras Loxocemidae Pythonidae Xenopeltidae
Ecology:
Distribution:
• Quaternary of Thailand (1 collection)
• Pliocene of Australia (5)
• Miocene to Pliocene of Kenya (2)
• Miocene of Australia (11), Kenya (4), Poland (1), United States (10: Florida, Kansas, Montana, Nebraska, South Dakota, Texas, Wyoming)
• Harrisonian of United States (2: Nebraska)
• Arikareean of United States (2: Oregon)
• Oligocene of Australia (2), United States (4: Nebraska, South Dakota, Wyoming)
• Eocene of Canada (2: Saskatchewan), United States (3: Georgia, North Dakota, Wyoming)
• Paleocene of United States (2: New Mexico)
Total: 51 collections including 55 occurrences