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68 results for “Sauropterygia”
FIGURE 6 in A phylogeny of Plesiosauria (Sauropterygia) and its bearing on the systematic status of Leptocleidus Andrews, 1922
FIGURE 6. Interpretation of the holotype skull of Libonectes morgani, SMU 69120, in dorsal (A) and palatal (B) views. See Appendix 1 for anatomical abbreviations.
FIGURE 20. 50 percent majority rule tree showing a in A phylogeny of Plesiosauria (Sauropterygia) and its bearing on the systematic status of Leptocleidus Andrews, 1922
FIGURE 20. 50 percent majority rule tree showing a hypothesis of relationship for Plesiosauria based on a Bayesian analysis of 31 OTUs and 152 characters. Branch support is indicated by posterior probabilities greater than or equal to 50.
Data from: Life-history strategies indicate live-bearing in Nothosaurus (Sauropterygia)
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Data from: A new Pliosaurus species (Sauropterygia, Plesiosauria) from the Upper Jurassic of Patagonia: new insights on the Tithonian morphological disparity of mandibular symphyseal morphology
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Data from: A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early–Middle Jurassic pliosaurids
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Data from: Tooth occlusal morphology in the durophagous marine reptiles, Placodontia (Reptilia: Sauropterygia)
Placodontia were a group of marine reptiles that lived in shallow nearshore environments during the Triassic. Based on tooth morphology it has been inferred that they were durophagous, but tooth morphology differs among species: placodontoid placodonts have teeth described as hemispherical, and the teeth of more highly nested taxa within the cyamodontoid placodonts have been described as flat. In contrast, the sister taxon to the placodonts, Palatodonta bleekeri, like many other marine reptiles, has tall pointed teeth for eating soft-bodied prey. The goals of this paper are to quantify these different tooth morphologies and compare tooth shape among taxa and with a functionally "optimal" tooth. To quantify tooth morphology we measured the radius of curvature (RoC) of the occlusal surface by fitting spheres to 3D surface scans or computed microtomographic scans. Large RoCs correspond to flatter teeth, while teeth with smaller RoCs are pointier; positive RoCs have convex occlusal surfaces, and a negative RoC indicates that the occlusal surface of the tooth is concave. We found the placodontoid taxa have teeth with smaller RoCs than more highly nested taxa, and palatine teeth tend to be flatter and closer to the optimal morphology than maxillary teeth. Within one well-nested clade, the placochelyids, the rearmost palatine teeth have a more complex morphology than the predicted optimal tooth, with an overall concave occlusal surface with a small, medial cusp. These findings are in keeping with the hypothesis that placodonts were specialized durophagous predators with teeth modified to break hard prey items while resisting tooth failure.
FIG. 8 in Les premiers sauroptérygiens (Reptilia, Sauropterygia) découverts dans le Trias français par Charles Antoine Gaillardot et leur interprétation par Georges Cuvier
FIG. 8. — Eusauropterygia, Calcaire à térébratules,Muschelkalk supérieur (Ladinien), Rehainviller, Meurthe-et-Moselle, spécimens envoyés par le chevalier de Villiers (A) et par Charles Antoine Gaillardot (D, F, H, J) à Georges Cuvier en 1824 et décrits par ce dernier sous le nom de «Saurien des environs de Lunéville »:A -C, Eusauropterygia indet., côte; A, MNHN.F.TRE77 (ancien numéro AC9531); B, étiquette collée sur le spécimen précédent; C, figure extraite de Cuvier (1824: pl. 22, fig. 18); D, E, Eusauropterygia indet., côte; D, MNHN.F.TRE76 (ancien numéro AC9530); E, figure extraite de Cuvier (1824: pl. 22, fig. 17); F, G, Simosaurus gaillardoti Meyer 1842b, ulna (extrémité distale tournée vers le haut); F, MNHN.F.TRE82 (ancien numéro AC9536); G, figure extraite de Cuvier (1824: pl. 22, fig. 15); H, I, Nothosaurus sp., coracoïde; H, MNHN.F.TRE81 (ancien numéro AC9535); I, figure extraite de Cuvier (1824: pl. 22, fig. 13); J, K, Nothosauroidea indet., ischion; J, MNHN.F.TRE83 (ancien numéro AC9537); K, figure extraite de Cuvier (1824: pl. 22, fig. 14). Échelle: 5 cm (les figures de Cuvier ne sont pas représentées à l'échelle).
Data from: Tooth occlusal morphology in the durophagous marine reptiles, Placodontia (Reptilia: Sauropterygia)
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