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Fig. 8 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 8. Drawings of selected pleurodontan mandibles in medial view, anterior to the right. A, reconstruction of Saichangurvel davidsoni with semitransparent areas representing restored areas; B, Gambelia copei; C, Hoplocercus spinosus (AMNH 93807); D, Leiocephalus carinatus. B, modified after McGuire (1996); D, modified after Frost and Etheridge (1989). Note the variability in the splenial morphology as it relates to the closure of Meckel's canal.

Fig. 6. A in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 6. A, photograph; and B, drawing of the posterodorsal view of the orbital wall and palate of Saichangurvel davidsoni (IGM 3/858).

Fig. 5 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 5. Drawings of dorsal skull surfaces in the area of the parietal foramen: A, Temujinia ellisoni; B, Zapsosaurus sceliphros; C, Priscagama gobiensis. Dorsal view of skulls: D, Ctenomastax parva; E, Gambelia wislizenii; F, Diplolaemus bibroni (REE 2506). A–C, modified after photos in Gao and Norell (2000); D, composite illustration modified after Gao and Norell (2000: figs. 3–4). Reconstructed areas are shown as semitransparent shadow layers. E, modified after Maisano (2003a).

Fig. 9 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 9. Anterior part of the skeleton of Saichangurvel davidsoni (IGM 3/858) in dorsolateral view to show the variability of the presacral vertebrae as it relates to vertebral length and neural spine morphology. See the text for details.

Fig. 4 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 4. Reconstructed skull of Saichangurvel davidsoni (IGM 3/858). A, dorsal view; B, left lateral view. Note that reconstructed elements appear as semiopaque shadows. No detail is given for the mandible in B, because only the medial view is visible as the specimen is preserved (see fig. 8).

Fig. 3 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 3. Skull of Saichangurvel davidsoni (IGM 3/858). A, photograph; and B, drawing of the skull as preserved, in dorsal view.

Fig. 7 in A Complete Late Cretaceous Iguanian (Squamata, Reptilia) from the Gobi and Identification of a New Iguanian Clade

Fig. 7. Drawing of the braincase, posterior skull roof, and anterior cervical vertebrae of Saichangurvel davidsoni (IGM 3/858): A, posterolateral view; B, lateral view.

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Text-fig. 2. Latest Albian – Late Cretaceous palaeobotanical-palaeogeographical subregions of the North Pacific Region (a); modern outline of North-eastern Asia is shown for the Coniacian (after Smith et al. 1981): 1 – the Verkhoyansk-Chukotka Subregion, 2 – the Okhotsk-Chukotka Subregion, 3 – the Anadyr-Koryak Subregion (modified from Herman 2013) and geographical and geological position of the Turonian – Coniacian floras (b) (present-day map, modified from Shczepetov and Herman 2013). in On The Likely Palaeoelevation Of The Turonian - Coniacian Arman Flora Site (North-Eastern Asia)

Text-fig. 2. Latest Albian – Late Cretaceous palaeobotanical-palaeogeographical subregions of the North Pacific Region (a); modern outline of North-eastern Asia is shown for the Coniacian (after Smith et al. 1981): 1 – the Verkhoyansk-Chukotka Subregion, 2 – the Okhotsk-Chukotka Subregion, 3 – the Anadyr-Koryak Subregion (modified from Herman 2013) and geographical and geological position of the Turonian – Coniacian floras (b) (present-day map, modified from Shczepetov and Herman 2013).

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Text-fig. 1. Palaeogeographical scheme (distribution of land and sea basins) in part of Eurasia at the beginning of the Late Cretaceous (modified from Spicer et al. 2008). The green leaf symbol indicates the site of the Arman Flora. Asterisks indicate the Okhotsk-Chukotka volcanogenic belt. Dashdotted line indicates the boundary between the Siberian- Canadian and Euro-Sinian palaeofloristic regions (modified from Vakhrameev 1991). in On The Likely Palaeoelevation Of The Turonian - Coniacian Arman Flora Site (North-Eastern Asia)

Text-fig. 1. Palaeogeographical scheme (distribution of land and sea basins) in part of Eurasia at the beginning of the Late Cretaceous (modified from Spicer et al. 2008). The green leaf symbol indicates the site of the Arman Flora. Asterisks indicate the Okhotsk-Chukotka volcanogenic belt. Dashdotted line indicates the boundary between the Siberian- Canadian and Euro-Sinian palaeofloristic regions (modified from Vakhrameev 1991).

Fig. 32 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 32. Part and counterpart of a lower jaw attributed to Neogastroplites americanus (Reeside and Weymouth, 1931) var. A Reeside and Cobban, 1960, USNM 129548, Mowry Shale, Park County, Wyoming. A. Overall view of the negative half showing a slit at the apex (arrow), 31. B. Overall view of the positive half. The sides are bent dorsally and display longitudinal creases, 31. C. Closeup of the anterior area in A, 32.9.

Fig. 21 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 21. Drawing of BHMNH 5456 (see fig. 20). A. Hypothetical cross section (restored) near the apex. B. Closeup of anterior end showing an elongate boss and narrow ridge along the midline. The horizontal lines indicate the crystalline struts that cross the grooves. Texture as defined in figure 4.

Fig. 15 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 15. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, BHMNH 5041, Baculites cuneatus Zone, Pierre Shale, Meade County, South Dakota. A. Ventral view, anterior end on top, showing bilobate posterior margin. The specimen retains a strong convex curvature, presumably similar to that in life, 31. B. Right lateral view with the anterior end (arrow) to the right. The anterior margin is weakly indented and the apex is slightly projected, 31. C. Anterior view, 31. D. Closeup of the anterior end showing the outline of the outer lamella (arrow), 33.1.

Fig. 11 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 11. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, TMP 92.42.21, Baculites cuneatus Zone, Bearpaw Shale, Welling, Alberta, Canada, ventral view, anterior end on top. A. Overview showing most of the right wing. The arrow indicates the position of the apex, 31. B. Closeup of the anterior end, 33.

Fig. 12 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 12. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, TMP 99.84.2, Baculites cuneatus Zone, Bearpaw Shale, Welling, Alberta, Canada, ventral view, anterior end on top, 31.

Fig. 6 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 6. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, AMNH 47277, Baculites cuneatus Zone, Bearpaw Shale, Welling, Alberta, Canada, ventral view, anterior end on top. A. Coated. B. Uncoated. Part of the coarsely crystalline black material is missing exposing two radial ridges flanked by grooves (arrows), which are expressed as grooves and ridges, respectively, on the dorsal side, 31.

Fig. 3 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 3. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, AMNH 47275, Baculites cuneatus Zone, Bearpaw Shale, Welling, Alberta, Canada, ventral view, anterior on top. A. Overview showing the ragged posterior margin, 31. B. Closeup of the anterior end showing the apical slit and Ushaped outline of the junction between the inner and outer lamellae (arrow), 33.

Fig. 2 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 2. Diagram of upper and lower jaws illustrating terminology and measurements. A. Dorsal view of upper jaw. B. Ventral view of upper jaw. C. Ventral view of lower jaw. D. Dorsal view of lower jaw. Abbreviation: a 5 apical angle.

Fig. 5 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 5. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, AMNH 47276, Baculites cuneatus Zone, Bearpaw Shale, Welling, Alberta, Canada, ventral view, anterior end on top, showing the curved anterior margin, 31.

Fig. 8 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 8. Drawings of AMNH 47277 (see figs. 6, 7). A. Hypothetical cross section near the apex. B. Hypothetical cross section approximately 20 mm from the apex. The two lamellae are separated on each side of the midline but fused together along the lateral margins. C. Anterior end showing the Vshaped edge of the outer lamella. Texture as defined in figure 4.

Fig. 20 in Jaws of Late Cretaceous Placenticeratid Ammonites: How Preservation Affects the Interpretation of Morphology

Fig. 20. Lower jaw of Placenticeras meeki Böhm, 1898, or Placenticeras costatum Hyatt, 1903, BHMNH 5456, Baculites cuneatus Zone, Pierre Shale, Meade County, South Dakota, ventral view, anterior end on top. The upper arrow indicates the edge of the outer lamella. The lower arrow indicates the separation between the two lamellae, fortuitously exposed at a break in the jaw, 32.7.