off the parietals from the squamosals. This contrasts with sauropsids (reptiles), but is similar to the condition in diadectomorphs and early synapsids. Microsaurs do not possess supratemporals, but in most members of the group, their large tabular bones disable parietal-squamosal contact. In more basal reptiliomorphs, this issue did not occur because an additional bone known as an intertemporal was present at the intersection of the four bones. Most reptiliomorphs which lost the intertemporal filled the space using a 'lappet' of the parietal bones. However, in Westlothiana, Limnoscelis, and lepospondyls, this space is filled by an expansion of the rear branch of the postorbital bone. This provides evidence for the placement of Westlothiana into lepospondyls. One of Westlothiana's autapomorphies (unique features) of the skull is the fact that the postfrontal bones, which typically occupy the upper rear corner of the orbits, are very elongated. They stretch forward to form almost the entire upper rim of the eye sockets, and possibly contact the prefrontal bones at the front edge of each socket. This level of contact is uncertain, and may be so slight that it can occur on one side of the skull and not the other. Nevertheless, the possession of any amount of contact between the prefrontal and postfrontal is a primitive feature lost by true amniotes. Palate Although the skull in general possesses a combination of amniote and non-amniote features, the palate noticeably lacks amniote adaptations. Most of these missing adaptations relate to the pterygoid bones, which are elongated blade-like structures that lie along the middle of the palate. The palate lacks "labyrinthodont" features such as large fangs, and instead the pterygoids are completely covered with small tooth-like prickles known as denticles. This is unusually primitive compared to early amniotes, which typically have denticles concentrated in only a few parts of the pterygoids. Several rows of denticles are also present along the palatine bones along the rim of the mouth, but apparently not the ectopterygoid bones immediately behind the palatines. The rear of the palate possesses a bone known as a parasphenoid, which has acquired an unusually complex dart-like shape. The pterygoids each have a thin rear branch that reaches as far back as the jaw joints, while further towards the front of the skull they converge together. Perhaps the most notable feature of the palate is the fact that the rear branches of the pterygoids are simple, with concave