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Figure 17 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 17. Photographs of Clevosaurus hudsoni specimen NHMUK PV R36832. A, gastralia in ventral view. B, enlarged view of apex of medial splint. C, enlarged view of overlap between medial and lateral splints.

Figure 10 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 10. Surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. A, anterolateral view of skull showing surfaces of slender bones hidden within the matrix (large cranial elements shown for relative position). B, posteroventral view of (A).

Figure 18 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 18. Photograph and surface models of Clevosaurus hudsoni left hind limb specimen NHMUK PV R36846. Specimen in (A, B) dorsal, (C) ventral and (D) posterolateral views.

Figure 7 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 7. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Left quadrate in (A) lateral and (B) medial views. Palate region in (C), (D) ventral view (refer to Fig. 3A for location of view). E, left lateral view of specimen between maxilla and dentary, showing bones out of position (refer to Fig. 3A for location of view). Possible left pterygoid in (F), (G) lateral view.

Figure 6 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 6. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Left nasal in (A) dorsolateral and (B) ventromedial views. C, right postfrontal in dorsal view. D, articulation between left postfrontal and left postorbital in anterolateral view. Left postorbital in (E) lateral and (F) medial views. Left prefrontal in (G) dorsolateral and (H) posterolateral views. Left jugal in (I) lateral and (J) medial views.

Figure 2. A in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 2. A, sketch of the original fissure locality, no longer in existence (modified after Robinson, 1957). B, photograph of the quarry from 1954; the 'pendulum' has already been removed (P.L. Robinson, unpublished notebook, NHMUK). C, copy of the original field sketch of fossil locality B by P.L. Robinson, redrawn with minor modification for clarity by the authors (after P.L. Robinson, unpublished notebook, NHMUK).

Figure 5 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 5. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Left maxilla in (A) lateral and (B) medial views. Parietals in (C) dorsal and (D) ventral views. Frontals in (E) dorsal and (F) ventral views.

Figure 12 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 12. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. A, right ischium in lateral view. B, pelvic girdle bones as preserved in the specimen, out of position (right ischium in medial view). C, postcranial bones at or near the pectoral region, left lateral view.

Figure 4 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 4. Postcranial bones of Clevosaurus hudsoni specimen NHMUK PV R36832. (A) photograph and (B) surface model (refer to Fig. 3B for location on specimen).

Figure 16 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 16. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Left scapulocoracoid in (A, B) lateral and (C) medial views. Left radius in (D) dorsolateral, (E) anterior and (F) posterior views.

Figure 15 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 15. Photograph and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. A, cervical and dorsal vertebrae in posterodorsal view. B, fourth cervical vertebra in lateral view. Third cervical vertebra in (C) anterior, (D) dorsal, (E) lateral and (F) posterior views. Second dorsal vertebra in (G) anterior, (H) dorsal, (I) lateral and (J) posterior views.

Figure 3 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 3. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. A, entire specimen. B, diagrammatic representation of the specimen with key showing location of views in (C–F) and in Figure 4. Skull bones in (C, D) dorsolateral view and (E, F) left lateral view (surface models are in artificial colour in all figures).

Figure 14 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 14. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. A, cervical vertebrae in lateral view. B, disarticulated atlas bones in lateral view. C, cervical vertebrae in lateral view. D, atlas and axis in lateral view. Atlas and axis in (E) anterior, (F) dorsal, (G) posterior and (H) ventral views.

Figure 9 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 9. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Left dentary in (A, C) lateral and (D) medial views. B, partial left dentary in lateral view showing wear facets. E, left articular complex in dorsal view. F, left surangular in lateral view. G, left articular in dorsal view. H, right articular in lateral view.

Figure 8 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 8. Photograph and surface models of Clevosaurus hudsoni specimen NHMUK PV R36832. Braincase bones in (A, B) posterodorsal, (C) right lateral and (D) anteroventral views.

Figure 19 in Anatomical study of two previously undescribed specimens of Clevosaurus hudsoni (Lepidosauria: Rhynchocephalia) from Cromhall Quarry, UK, aided by computed tomography, yields additional information on the skeleton and hitherto undescribed bones

Figure 19. Photographs and surface models of Clevosaurus hudsoni specimen NHMUK PV R36846. A, distal head of broken femur in ventrolateral view. Left tibia in (B) anterior, (C) lateral and (D) posterior views. Left fibula in (E) anterior and (F) posterior views. G, astragalus, calcaneum and tarsal bones in dorsal view. H, digit i in dorsolateral view. I, digit i phalanx and ungual in dorsolateral view. Astragalus and calcaneum in (J) dorsal and (K) ventral views.

Figure 5 in A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

Figure 5. Reduced strict consensus (after removing Pamizinsaurus) of sphenodontian interrelationships from 24 most parsimonious trees of 186 steps showing the phylogenetic position of Sphenocondor gracilis gen. et sp. nov. Bremer support and frequency differences (GC), calculated by symmetric resampling, are indicated above the nodes.

Figure 4 in A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

Figure 4. Symphyseal region of the dentary and successional teeth of selected rhynchocephalians. A, Sphenocondor gracilis gen. et sp. nov., holotype (MPEF-PV 2358). B, Godavarisaurus lateefi, juvenile. C, Godavarisaurus lateefi, mature; D, Diphydontosaurus avonis. E, Rebbanasaurus jaini, juvenile. F, Rebbanasaurus jaini, immature. G, Sphenodon punctatus, mature. H, Clevosaurus hudsoni, immature. I, Clevosaurus hudsoni, adult. B, C, E, and F redrawn from Evans et al. (2001:figs 5B, D, 13A, C), C reversed; D redrawn from Whiteside (1986:fig. 28), but reversed; G redrawn from Throckmorton, Hopson & Parks (1981:fig. 1B), but reversed; H and I redrawn from Fraser (1988:figs 19b, 23b). Abbreviations: 1–5, successional tooth positions; ht, hatchling teeth; lps, postsymphyseal lamina; Mg, Meckelian groove; sr, symphyseal recess; st, successional teeth; sy, symphysis. Scale bars = 1 mm.

Figure 6. A in A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

Figure 6. A, time-tree of rhynchocephalians with the latest possible branching points for lineages, based on the reduced strict consensus of Figure 5. The Middle Jurassic is depicted by a shaded bar. B, palaeobiogeographical distribution of Jurassic rhynchocephalians. Palaeogeographical reconstruction modified from Blakey (2008), using the timescale of Gradstein et al. (2004). Abbreviation: CGD, Central Gondwanan Desert.

Figure 3 in A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: new insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

Figure 3. Sphenocondor gracilis gen. et sp. nov., holotype (MPEF-PV 2358), right dentary. A, close-up of coronoid region in lingual view. B, sagittal section of dentary bearing posterior hatchling teeth in lingual view. C, 'caniniform' successional teeth in lingual view. D, internal structure of most posterior hatchling teeth. E, last middle and first posterior hatchling teeth in labial view. Photographs in A, B, C, and D reversed. Abbreviations: adc, adductor fossa; afl, anterior flange; cp, coronoid process; dpp, dentary posterior process; en, enamel; gr, groove; hed, hyaline external dentine; id, internal dentine; Mc, Meckelian canal; mht, middle hatchling tooth; pht, posterior hatchling tooth; phtt, posterior hatchling teeth; pul, pulpar cavity; st4, fourth successional tooth; st5, fifth successional tooth.