sentences:  The subfamily Ungaliophiinae was formerly made up of 4 genera.Two of these ("Tropidophis" and "Trachyboa") are actually more closely related to red pipesnakes than to boas, and are now placed in the Tropidophiidae within the Amerophidia.The other two genera, "Ungaliophis" and "Exiliboa", are the sister group of the "Charina-Lichanura" clade, within Boidae.