 "B. mariantensis" is unique among other known rhynchosaurs by possessing a contact between the prefrontal and postfrontal bones that excludes the frontals from the eye socket.A phylogenetic analysis recovered it in an advanced position with the Stenaulorhynchinae, as the sister taxon of "Stenaulorhynchus stockleyi" from the late Anisian of Manda beds, Tanzania."B.