postorbital; po, postzygapophysis; pop, paraoccipital process; posf, postspinal fossa; pp, parapophysis; pr, prezygapophysis; prel, pre- zygoepopiphyseal lamina; pvp, posteroventral process; S, squa- mosal; sot, supraoccipital tuberosity; stf, supratemporal fenestra; vp, ventral processes...