Figure 2 in An investigation into the cladistic relationships and monophyly of therocephalian therapsids (Amniota: Synapsida)

Figure 2. Hypotheses of therocephalian relationships: A, Hopson & Barghusen (1986); (B) van den Heever (1994). Two hypotheses of basal therocephalian relationships are demonstrated in (B): the 'Pristerosauria' hypothesis (left) and the 'Scylacosauria' hypothesis (right).