Parent taxon: Boidae according to K. T. Smith 2013
Sister taxa: Anilioides, Boinae, Cadurcoboa, Candoia, Chilabothrus, Dawsonophis, Erycinae, Eunectes, Hechtophis, Lithophis, Messelophis, Neurodromicus, Paraplatyspondylia, Python, Rageophis, Rieppelophis, Totlandophis, Tropidophis
Subtaxa: Calamagras Exiliboa Paraungaliophis Ungaliophis
Ecology: carnivore
Distribution:
• Miocene of United States (6: Delaware, Florida, South Dakota, Texas, Wyoming collections)
• Harrisonian of United States (2: Nebraska)
• Oligocene of Mongolia (1), United States (10: Colorado, Florida, Nebraska, South Dakota, Wyoming)
• Eocene of Canada (1: Saskatchewan), France (7), Kyrgyzstan (1), the United Kingdom (2), United States (5: New Mexico, North Dakota, Wyoming)
• Paleocene to Eocene of Brazil (1)
• Paleocene of Togo (1)
Total: 37 collections including 42 occurrences