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FIGURE 4 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 4. The skull of Shartegodon altai PSS-MAE 633 (holotype) in (A) left lateral and (B) right lateral views (top) with accompanying line drawings (bottom). Dark gray indicates matrix; light gray indicates the upper postcanines. Abbreviations: Bo, basioccipital; CoP, coronoid process of dentary; F, foramina; I1, first upper incisor partial root; I2, second upper incisor partial root; IF, infraorbital foramen; J, jugal; La, lacrimal; MF, masseteric fossa; Mx, maxilla; N, nasal; PC, upper postcanine teeth; Pmx, premaxilla; Zy, zygoma. Scale bar = 5 mm.

FIGURE 11 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 11. The skull of Nuurtherium baruunensis PSS-MAE 632 (holotype; above) with accompanying line drawing (opposite page). Dark gray indicates matrix; light gray indicates the upper postcanines. Abbreviations: AP, angular process of dentary; Co, coronoid; CoP, coronoid process of dentary; crt, crypt for replacement

FIGURE 3 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 3. The skull of Shartegodon altai PSS-MAE 633 (holotype) in (A) ventral and (B) dorsal views (above) with accompanying line drawings (opposite page). Dark gray indicates matrix; light gray indicates the upper postcanines. Abbreviations: CoP, coronoid process of dentary; GPF, greater palatine foramina; FO, fenestra

FIGURE 6 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 6. Right partial ramus of Shartegodon altai PSS-MAE 633 (holotype) in (A) lateral and (B) medial views. Abbreviation: MG, meckelian groove. Scale bar = 5 mm.

FIGURE 15 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 15. Size distribution of upper postcanines in selected tritylodontids species. Dashed line indicates location where length and width are equal. Source of measurements are provided in table 2.

FIGURE 13 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 13. Lower right postcanine teeth of Nuurtherium baruunensis PSS-MAE 632 (holotype) in (A) lingual view of the crowns and (B) lingual views of crowns and roots. Abbreviations: b, buccal; l, lingual.

FIGURE 2 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 2. Dental cusp nomenclature of the postcanine teeth of tritylodontids used in this paper (modified from Setoguchi et al., 1999; Matsuoka, 2000; and Watabe et al., 2007). Abbreviations: B, buccal; M, medial; L, lingual; b, buccal; l, lingual.

FIGURE 1 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 1. Map of Mongolia, showing the Shar Teg (filled star) locality of the Gobi-Altai Aimag (gray area).

FIGURE 12 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 12. Upper right postcanine teeth of Nuurtherium baruunensis PSS-MAE 632 (holotype) in lingual views with accompanying line drawing. Gray indicates matrix; hatching indicates damage teeth surface. The identity of the buccal, medial, and lingual cusps are labeled on the line drawing. Abbreviations: B, buccal; M, medial; L, lingual.

FIGURE 10 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 10. Right lower postcanine teeth of Shartegodon altai PSS-MAE 633 (holotype) in lingual views, illustrating the shape of the roots.

FIGURE 9 in Two new tritylodontids (Synapsida, Cynodontia, Mammaliamorpha) from the Upper Jurassic, southwestern Mongolia

FIGURE 9. Lower postcanine dentition of Shartegodon altai PSS-MAE 633 (holotype) in occlusal views. Abbreviations: b, buccal; l, lingual; pc, lower postcanine teeth.

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Text-fig. 2. General view of Helwell Bay, Doniford, looking west along the upper beach exposure and the Main Cenoceras Bed. in 'Cenoceras Islands' In The Blue Lias Formation (Lower Jurassic) Of West Somerset, Uk: Nautilid Dominance And Influence On Benthic Faunas

Text-fig. 2. General view of Helwell Bay, Doniford, looking west along the upper beach exposure and the Main Cenoceras Bed.

Figure 8 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 8. Metriorhynchid taxonomy in historical perspective: main changes in taxon names from their original description (left column) to this paper (right column), passing through definitions by Fraas (1902) and Steel (1973). The cladogram on the right is a reduced version of the strict consensus tree in Figure 7. The grey areas indicate monophyletic genera in this taxonomic arrangement.

Figure 5. Comparative cranial morphology for derived metriorhynchid species. A in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 5. Comparative cranial morphology for derived metriorhynchid species. A, Dakosaurus maximus neotype, SMNS 8203. B, Enaliosuchus schroederi holotype, MMGLV. C, Geosaurus araucanensis holotype, MLP 72-IV-7-1. The relative position of the orbit is indicated for Dakosaurus. Scale bars: 20 mm.

Figure 3 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 3. The second specimen of Geosaurus giganteus, NHM R.1230, preserving remnants of the skull in dorsal (top left) and ventral (top right) views, as well as postcranial elements (bottom). The white arrows indicate the impressions of nonpreserved vertebrae on the matrix. Scale bar: 20 mm.

Figure 1 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 1. Lateral views and line drawings of the type of Geosaurus giganteus (Von Sömmerring, 1816), showing the right (top) and the left (bottom) sides of the specimen (NHM R.1229). Line drawings show the interpretation of sutures and the main features of the specimen; the grey shading represents fossae. Scale bars: 20 mm.

Figure 4 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 4. Lateral view of the third, and forgotten, specimen of Geosaurus giganteus: NHM 37020. A, lateral view of the entire cranium. B, close-up of the tooth row, with the arrows highlighting the enlarged dentary tooth and the notch for its reception, whereas the box shows the occlusion of the maxillary/dentary teeth. Scale bars = 20 mm.

Figure 7 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 7. Strict consensus of 4104 most parsimonious cladograms, with bootstrap support for each node (tree length = 578; consistency index, CI = 0.436; retention index, RI = 0.861; rescaled consistency index, RC = 0.376). On the left, the position of Thalattosuchia relative to other Crocodylomorpha is shown, whereas, on the right the Metriorhynchoidea is separated to aid visualization. Arrows denote stem-based clades, whereas squares indicate node-based clades.

Figure 2 in What is Geosaurus? Redescription of Geosaurus giganteus (Thalattosuchia: Metriorhynchidae) from the Upper Jurassic of Bayern, Germany

Figure 2. Dental facets and their occurrence in Geosaurus giganteus. The close-up on the dentition of NHM R.1229 (left), and the corresponding line drawing (centre), shows the gross morphology of the teeth, with their distinctly triangular shape. On the right, a cross section of one tooth is shown, with the three labial facets indicated by arrow heads. On the lower right: an occlusal view of an isolated tooth of Geosaurus (SMNS 81834) displaying the facets and their limits, at the labial face of the crown. Scale bars: 20 mm.