Amerophidia
The Amerophidia, also known as amerophidian snakes, are a clade of snakes that contains two families: Aniliidae and the boa-like Tropidophiidae and Tropidophis ).
The sister-group relationship between these two families is surprising and unintuitive when only morphology is considered, because Aniliidae more closely resemble the Asian pipe snakes in the families Cylindrophiidae and Anomochilidae, whereas Tropidophiidae more closely resemble constricting, macrostomatan snakes such as Boidae and Pythonidae. However, every major phylogenetic analysis since 2007 has found support for the idea that these two families are one another's closest relatives, despite having last shared a common ancestor about 91 MYA . The oldest fossil member of this family is the extinct Australophis from the Late Cretaceous of Argentina.