Fig. 4 in A Triassic crown squamate

Fig. 4. Isolated elements of C. microlanius showing squamate features. (A) Medial view of right maxilla NHMUK PV R37279 with recurved mid and posterior teeth, resorption pits, erupting teeth on many pleurodont emplacements. (B and C) Fused premaxilla NHMUK PV R37378 in postero-palatal view (B) showing incisive processes, foramina, and characteristic asymmetrical number of teeth, 4 on right premaxilla, 3 on left, and anterior view (C). (D) Right postero-lateral view of braincase NHMUK PV R37377 showing oto-occipital, ascending process of supraoccipital and laterally expanded paroccipital process. (E) Ventral CT scan view of same braincase with similar basioccipital to holotype. (F) Lower part of braincase in lateral view showing damaged exoccipital where vagus foramen should be (posterior to crista tuberalis but anterior and above hypoglossal foramen). (G) Posterior CT scan view of right side showing damaged exoccipital; lines show position of (H). (H) Close-up, in lower posterior medial view showing hypoglossal foramina on damaged exoccipital part of otoccipital. (I) CT scan of otoccipital in lateral view showing squamate features: lateral opening of recessus scala tympani (label to opening), medial opening of recessus scala tympani, crista tuberalis, crista interfenestralis, and occipital recess. All scale bars, 2 mm [bottom bar is for (I)]. Image (H) is 0.75 mm across. C, crista; Con, condyle; Er, erupting; Ex, exoccipital; Fov, fenestra ovalis; Fu, fused; Hg, hypoglossal; If, interfenestralis; Inv, incisive; Lrst, lateral opening of recessus scala tympani; Md, median; Mrst, medial opening of recessus scala tympani; Oc, occipital; Op, opening; Pacp, paroccipital process; Pras, processus ascendens; Rec, recess; Sut, suture; Tb, tuberalis; Th, tooth.