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.
James Hopson and Herbert Richard Barghusen (1986 p. 88) initially linked Biarmosuchidae and Ictidorhinidae (including Hipposauridae and Rubidginidae) into the "Biarmosuchia", but were unclear whether it represented a natural group or merely shared primitive characteristics.