Evidence for therapsid fur centers on the presence of infraorbital pits and ridges in some lower Triassic cynodonts. |
Pelycosaur, therapsid, and mammal represent three evolutionary grades in a single progressive evolutionary axis. |
Baird and Olsen's report of a dicynodont therapsid was based on the partial braincase reidentified here as that of a paracrocodylomorph pseudosuchian. |