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Figure 5. Belebey vegrandis, SGU 104 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 5. Belebey vegrandis, SGU 104/B-2020: right mandible in medial, lateral and occlusal views. Scale bar = 1 cm; see Appendix 1 for abbreviations list.

Figure 11 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 11. Phylogenetic relationships of Bolosauridae within a temporal context: thick lines represent the known fossil record of particular taxa; thin lines represent reconstructed histories of individual lineages (ghost lineages).

Figure 7. Belebey vegrandis, SGU 104 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 7. Belebey vegrandis, SGU 104/B-2021: skull and mandible in dorsal and lateral views. Scale bar = 1 cm; see Appendix 1 for abbreviations list.

Figure 10 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 10. Cladogram showing patterns of bolosaurid relationships: bold numbers indicate bootstrap values; numbers in brackets are decay indices. A, Ankyramorpha; E, Eureptilia; P, Parareptilia; R, Reptilia.

Figure 9 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 9. Belebey vegrandis: cranial reconstruction in palatal, dorsal, and lateral views, and reconstruction of the mandibles in occlusal view. The anterior opening in palatal view between the maxilla and the vomer, shown in grey, represents the primary internal naris, but the vomer is sutured to the palatines posteriorly, blocking off any possible air passage. It is unlikely that this opening was used for respiration. Instead, the small space between the posterior edge of the vomer and the anterior edge of the palatine, shown in black, represents a new opening (choana) for the passage of air between the nasal capsule and the throat.

Figure 2 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 2. Skull of Belebey vegrandis, SGU 104/B-2020: antorbital region of the skull roof and the palate in both dorsal and ventral views. Scale bar = 1 cm; see Appendix 1 for abbreviations list.

Figure 1 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 1. Skull of Belebey vegrandis, SGU 104/B-2020: antorbital region and palate in lateral view, and skull table and temporal region in dorsal view. These are parts of the same skull, prepared and separated from each other. Scale bar = 1 cm; see Appendix 1 for abbreviations list.

Figure 4. Belebey vegrandis, SGU 104 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 4. Belebey vegrandis, SGU 104/B-2020: left mandible in medial and lateral views. Scale bar = 1 cm; see Appendix 1 for abbreviations list.

Figure 8. Belebey vegrandis, SGU 104 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 8. Belebey vegrandis, SGU 104/B-2021: photograph of skull and mandible in palatal view. The skull was not available for illustration in this view. Arrow points to ventral location of the mandibular foramen (mf). Scale bar = 1 cm.

Figure 6. Belebey vegrandis, SGU 104 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 6. Belebey vegrandis, SGU 104/B-2020: photograph of left and right mandibular rami in occlusal view. Scale bar = 1 cm.

Figure 3 in The cranial osteology of Belebey vegrandis (Parareptilia: Bolosauridae), from the Middle Permian of Russia, and its bearing on reptilian evolution

Figure 3. Skull of Belebey vegrandis, SGU 104/B-2020: photograph of the antorbital area of the skull in anterior view, showing details of the palate, the medial process of the prefrontal, and the palatine–prefrontal buttress. The dorsal surface of the maxilla, where the largest maxillary teeth are attached, is pockmarked. Scale bar = 1 cm; see Appendix 1 for abbreviations list.