Extended Data Figure 1: Digital reconstruction of segmented cranial elements of Eunotosaurus africanus CM 777.

a, Palatal view with the lower jaws digitally removed and major roofing elements not rendered. b, Anteromedial view of left palate showing moderately sized suborbital fenestra. c, d, Posteromedial (c) and anterolateral (d) views of left quadrate, prootic, stapes, epipterygoid and midline parabasisphenoid. e, Right lateral view of anterior braincase wall and surrounding elements. Note sutural contact of prootic and quadrate. f–k, Lower jaws in dorsal (f), ventral (g), left lateral (h), medial (left jaw) (i), anterior (j), and posterior (k) views. an, angular; ar, articular; bs, parabasisphenoid; co, coronoid; d, dentary; ect, ectopterygoid; epi, epipterygoid; fr, frontal; ju, jugal; la, lacrimal; ls, laterosphenoid; mx, maxilla; op, opisthotic; pa, parietal; pf, prefrontal; pl, palatine; pm, premaxilla; po, postorbital; pof, postfrontal; pr, prootic; pra, prearticular; pt, pterygoid; q, quadrate; qj, quadratojugal; s, stapes; sq, squamosal; sof, suborbital fenestra; sp., splenial; st, supratemporal; sa, surangular; v, vomer; II, inferred exit point for orbital nerve; V, prootic incisure, exit point for trigeminal nerve.