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Fig. 12. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 12. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). USNM 482433, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 9. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 9. A, B. Didymoceras nebrascense (Meek and Hayden, 1856a). YPM 6131A, plaster cast of Hyatt's (1894) second specimen described as Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 8. A, B in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 8. A, B. Didymoceras stevensoni (Whitfield, 1877). BHMNH 4039, collected by Howard Ehrle, Pierre Shale of Carter County, Mont. C, D. Didymoceras nebrascense (Meek and Hayden, 1856a). C. USNM 482430, USGS Mesozoic locality D85 (fig. 2, loc. 23). D. YPM 6131B, plaster cast of one of two specimens described by Hyatt (1894) as the new genus and species Emperoceras beecheri, Pierre Shale near Buffalo Gap, S. Dak. Figures are ×1.

Fig. 11 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 11. Didymoceras nebrascense (Meek and Hayden, 1856a). A, B. USNM 482432, USGS Mesozoic locality D2148 (fig. 2, loc. 10). C. USNM 450333, USGS Mesozoic locality D1422 (fig. 2, loc. 13). Figures are ×1.

Fig. 17 in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 17. Part of the external suture of Didymoceras stevensoni (Whitfield, 1877). E is the external lobe and L is the lateral lobe. The heavy, straight line marks the middle of the venter. USNM 482436, USGS Mesozoic locality D4446 (fig. 2, loc. 47).

Fig. 15. A–C in Late Campanian (Cretaceous) Heteromorph Ammonites From The Western Interior Of The United States

Fig. 15. A–C. Three views of the holotype of Helicoceras stevensoni Whitfield, 1877 (from Whitfield, 1880: pl. 14, figs. 5–7). Figures are

Fig. 29 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 29. Globaura venusta: A–C, IGM 3/164, nearly complete skull with mandibles from Khulsan, dorsal, ventral, and right lateral views; D–F, IGM 3/160, nearly complete skull with mandibles from Ukhaa Tolgod, dorsal, ventral, and left lateral views.

Fig. 25 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 25. Skull of Parmeosaurus scutatus, new genus and species: A–C, IGM 3/139, incomplete skull with mandibles, dorsal, ventral, and right lateral views; D–F, IGM 3/140, incomplete skull with mandibles, dorsal, ventral, and left lateral views.

Fig. 28 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 28. Scincomorpha, family incertae sedis, Slavoia darevskii: A, B, IGM 3/154, incomplete skull with mandible and partial postcranial skeleton from Khulsan, dorsal and ventral views; C, IGM 3/145, nearly complete skull with mandibles and partial postcranial skeleton from Ukhaa Tolgod, dorsal view D, IGM 3/146, incomplete skull with mandibles and articulated postcranial skeleton from Ukhaa Tolgod dorsal view.

Fig. 37 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 37. Virtually complete lizard skeleton from Ukhaa Tolgod, dorsal view (courtesy of Amy Davidson).

Fig. 36 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 36. Exceptional preservation of lizard specimens at Ukhaa Tolgod: A, SEM photograph of unworn dentary teeth of IGM 3/50 (Carusia intermedia), ×20; B, higher magnification of three posterior teeth in lingual view, ×50; C, undistorted braincase of a possible iguanian, arrows pointing to lateral semicircular canal.

Fig. 19 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 19. Tchingisaurus multivagus: A–C, IGM 3/129, incomplete skull with mandibles, dorsal, left and right lateral views.

Fig. 24 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 24.?Scincoidea, family incertae sedis, Parmeosaurus scutatus, new genus and species: A, B, IGM 3/138 (holotype), skull with articulated postcranial skeleton from Ukhaa Tolgod, dorsal and ventral views.

Fig. 15 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 15. Scincomorpha, Teiidae (Polyglyphanodontinae), Adamisaurus magnidentatus: A– C, IGM 3/116, nearly complete skull with mandibles from Tugrugeen Shireh, dorsal, left and right lateral views.

Fig. 14 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 14. Gekkota incertae sedis, Myrmecodaptria microphagosa, new genus and species: A–C, IGM 3/95 (holotype), incomplete skull with mandibles from Ukhaa Tolgod, left lateral, dorsal, and ventral views.

Fig. 13 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 13. Iguania incertae sedis, Isodontosaurus gracilis: A, B, IGM 3/91, cranial part of a skeleton preserved in concretion from Tugrugeen Shireh, dorsal and left lateral views; C, D, IGM 3/92, incomplete skull with mandibles from Tugrugeen Shireh, dorsal and ventral views.

Fig. 12 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 12. Iguania incertae sedis, Isodontosaurus gracilis: A–C, IGM 3/84, incomplete skull with mandibles from Ukhaa Tolgod, dorsal, ventral, and lateral views.

Fig. 33 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 33. Anguimorpha, Varanoidea, Cherminotus longifrons: A, B, IGM 3/170, incomplete skull with mandibles and cervical vertebrae from Tugrugeen Shireh, dorsal and lateral views.

Fig. 27 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 27. Scincomorpha, family incertae sedis, new genus and species (unnamed): A–C, IGM 3/54 incomplete skull with mandibles, lateral, dorsal and ventral views.

Fig. 10 in Taxonomic Composition And Systematics Of Late Cretaceous Lizard Assemblages From Ukhaa Tolgod And Adjacent Localities, Mongolian Gobi Desert

Fig. 10. Priscagama gobiensis: A, B, IGM 3/77, incomplete skull with mandibles from Ukhaa Tolgod, dorsal and ventral views; C, D, IGM 3/80, incomplete skull with mandibles from Ukhaa Tolgod dorsal and ventral views.