Although almost every therocephalian lineage ended during the great Permian -- Triassic extinction event , a few representatives of the subgroup called Eutherocephalia survived into the Early Triassic .
Although almost every therocephalian lineage ended during the great Permian -- Triassic extinction event , a few representatives of the subgroup ( called Eutherocephalia ) survived into the early Triassic and continued to diversify .