Fig. 4 in The sixth sense in mammalian forerunners: Variability of the parietal foramen and the evolution of the pineal eye in South African Permo-Triassic eutheriodont therapsids

Fig. 4. Skulls of Dicynodontia illustrating the great variability of the shape and size of parietal foramen in Therapsida. A. Large and circular parietal foramen, with a pineal boss in Rachiocephalus, RC 95, Derdedrif, Adendorp, South Africa, Cistecephalus–Tropidostoma AZ, 260–255 Ma. B. Slit-like parietal foramen in Dinanomodon, RC09, Stylkrans, South Africa, Cistecephalus AZ, 250–255 Ma. C. Absent foramen in Cistecephalus, BPI/1/506, Towerwater, Murraysburg, South Africa, Cistecephalus AZ, 250–255 Ma.