Fig. 1. Zangerlia ukhaachelys. IGM 90 in Zangerlia ukhaachelys, New Species, a Nanhsiungchelyid Turtle from the Late Cretaceous of Ukhaa Tolgod, Mongolia

Fig. 1. Zangerlia ukhaachelys. IGM 90/1, holotype, Upper Cretaceous of Mongolia. Photographs were manipulated digitally to enhance sutures. A, Oblique dorsal view of mandible; B, dorsal view of mandible; C, dorsal view of cranium; D, ventral view of cranium. Abbreviations: desc proc, descending process of frontal; ex, exoccipital; fr, frontal; mx, maxilla; op, opisthotic; pa, parietal; pf, prefrontal; pm, premaxilla; po, postorbital; pro, prootic; qu, quadrate; rec lab op, recessus labyrinthicus opisthoticus; rec lab pro, recessus labyrinthicus prooticus; so, supraoccipital; vo, vomer;?, bone of uncertain homology.