They replaced the pelycosaurs as the dominant large land animals in the Middle Permian and were replaced, in turn, by the archosauromorphs in the Triassic, although one group of therapsids, the kannemeyeriiforms, remained diverse in the Late Triassic.
They replaced the pelycosaurs as the dominant large land animals in the Middle Permian. They were replaced by the archosauromorphs in the Triassic. This was in turn. One group of therapsids remained diverse in the Late Triassic. This was in turn. Therapsids were the kannemeyeriiforms.