James Hopson and Herbert Richard Barghusen (1986 p. 88) tentatively united Biarmosuchidae and Ictidorhinidae (including Hipposauridae and Rubidginidae) as "Biarmosuchia", but were undecided as to whether they constituted a natural group or an assemblage that had in common only shared primitive characteristics.
Researchers James Hopson and Herbert Richard Barghusen (1986 p. 88) initially combined Biarmosuchidae and Ictidorhinidae, including Hipposauridae and Rubidginidae, under the "Biarmosuchia" classification, but were undecided about whether it represented a natural family or simply a collection of related primitive species.