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5 results for “Euparkeria”
Data from: The endocast of Euparkeria sheds light on the ancestral archosaur nervous system
<p>Understanding the evolution of the tetrapod brain is essential to trace the history of ecomorphological diversification of modern clades. While previous studies focused on the morphological transformation of the nervous system along the dinosaur-bird transition, little is known about the brain anatomy of archosauriformes and early archosaurs. Here, we describe the endocast of <em>Euparkeria</em> <em>capensis</em>, a small-bodied, terrestrial archosauriform closely related to Archosauria, with the goal of resolving the current uncertainties surrounding the ancestral condition of the archosaurian nervous system. The endocast of <em>Euparkeria</em> is sigmoidal, with large olfactory bulbs, an expanded cerebral hemisphere and an elongated flocculus. We suggest that this pivotal taxon was an active predator with a remarkable olfactory acuity. Overall, the endocast of <em>Euparkeria</em> resembles the ones observed in phytosaurs, crocodilians and early dinosaurs, implying that modern crocodilians retain an archosaurian plesiomorphic brain morphology.</p>
Data from: The endocast of Euparkeria sheds light on the ancestral archosaur nervous system
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text-fig. 4. Skull reconstructions of representatives of riassic OTUs in left lateral view, a, Euparkeria capensis, Early Triassic (Scythian-Anisian), Beaufort Group, South Africa; redrawn from Ewer (1965). B, basal ornithischian Lesothosaurus diagnostics, Early Jurassic (Hettangian-Sinemurian), Elliot Formation, Lesotho; redrawn from Sereno (1991b). c, prosauropod sauropodomorph Plateosaurus sp., Late riassic (Norian), Knollenmergel, Germany; based on MB R. 1937. D, Eoraptor lunensis, Late Triassic (Camian), Ischigualasto Formation, Argentina; based on PVSJ 512. E, Herrerasaurus ischigualastensis, Late Triassic (Camian), Ischigualasto Formation, Argentina; redrawn from Sereno and Novas (1993). F, Coelophysis bauri, Late riassic (Norian), Chinle Formation, south-western USA; modified from Paul (1993). G, Lilienstemus lilienstemi, Late riassic (Norian), Knollenmergel, Germany; based on MB R. 2175, unpreserved elements shaded. H, Shuvosaurus inexpectatus, Late riassic (Norian), Dockum Group, Texas, USA; based on TU P 9280. Abbreviations: a, angular; aof, antorbital fenestra; d, dentary; emf, external mandibular fenestra; en, external nares; eo, exoccipital; f, frontal; itf, infratemporal fenestra; j, jugal; 1, lacrimal; m, maxilla; n, nasal; o, orbit; oc, occipital condyle; op, opisthotic; pa, parietal; pd, predentary; pm, premaxilla; pm-mf, premaxillary-maxillary fenestra; po, postorbital; pof, postfrontal; q, quadrate; qf, quadrate foramen; qj, quadratojugal; sa, surangular; saf, surangular foramen; snf, subnarial foramen; sob, supraorbital; soc, supraoccipital; sp, splenial; sq, squamosal; stf, supratemporal fenestra. Scale bars represent 10 mm (a-b) and 50 mm (c-H). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 4. Skull reconstructions of representatives of riassic OTUs in left lateral view, a, Euparkeria capensis, Early Triassic (Scythian-Anisian), Beaufort Group, South Africa; redrawn from Ewer (1965). B, basal ornithischian Lesothosaurus diagnostics, Early Jurassic (Hettangian-Sinemurian), Elliot Formation, Lesotho; redrawn from Sereno (1991b). c, prosauropod sauropodomorph Plateosaurus sp., Late riassic (Norian), Knollenmergel, Germany; based on MB R. 1937. D, Eoraptor lunensis, Late Triassic (Camian), Ischigualasto Formation, Argentina; based on PVSJ 512. E, Herrerasaurus ischigualastensis, Late Triassic (Camian), Ischigualasto Formation, Argentina; redrawn from Sereno and Novas (1993). F, Coelophysis bauri, Late riassic (Norian), Chinle Formation, south-western USA; modified from Paul (1993). G, Lilienstemus lilienstemi, Late riassic (Norian), Knollenmergel, Germany; based on MB R. 2175, unpreserved elements shaded. H, Shuvosaurus inexpectatus, Late riassic (Norian), Dockum Group, Texas, USA; based on TU P 9280. Abbreviations: a, angular; aof, antorbital fenestra; d, dentary; emf, external mandibular fenestra; en, external nares; eo, exoccipital; f, frontal; itf, infratemporal fenestra; j, jugal; 1, lacrimal; m, maxilla; n, nasal; o, orbit; oc, occipital condyle; op, opisthotic; pa, parietal; pd, predentary; pm, premaxilla; pm-mf, premaxillary-maxillary fenestra; po, postorbital; pof, postfrontal; q, quadrate; qf, quadrate foramen; qj, quadratojugal; sa, surangular; saf, surangular foramen; snf, subnarial foramen; sob, supraorbital; soc, supraoccipital; sp, splenial; sq, squamosal; stf, supratemporal fenestra. Scale bars represent 10 mm (a-b) and 50 mm (c-H).
text-fig. 7. Outgroup (a) and theropod (b-g) skull reconstructions in lateral view showing different character states of several cranial characters. For sources of reconstructions and identifications of the bones see Text-figures 4-6. a, Euparkeria capensis. B, Syntarsus rhodesiensis. c, Ceratosaurus sp. D, Allosaurus fragilis. E, Gorgosaurus libratus. F, Velociraptor mongoliensis. Character state indications in this and all following illustrations are as follows: numbers refer to characters discussed in the text; the first number indicates the number of the character, the second the character state. Scale bars represent 10 mm (a-b), 50 mm (f-g) and 100 mm (c-e). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 7. Outgroup (a) and theropod (b-g) skull reconstructions in lateral view showing different character states of several cranial characters. For sources of reconstructions and identifications of the bones see Text-figures 4-6. a, Euparkeria capensis. B, Syntarsus rhodesiensis. c, Ceratosaurus sp. D, Allosaurus fragilis. E, Gorgosaurus libratus. F, Velociraptor mongoliensis. Character state indications in this and all following illustrations are as follows: numbers refer to characters discussed in the text; the first number indicates the number of the character, the second the character state. Scale bars represent 10 mm (a-b), 50 mm (f-g) and 100 mm (c-e).
Supplementary data for "The craniomandibular anatomy of the early archosauriform Euparkeria capensis and the dawn of the archosaur skull"
<p>Supplementary material for "The craniomandibular anatomy of the early archosauriform<br> Euparkeria capensis and the dawn of the archosaur skull"</p> <p>Contains:</p> <p>-3D surface model of skull of SAM-PK-5867</p> <p>-3D surface renderings of CT scans of SAM-PK-5867, SAM-PK-6047A, UMZC T.692a</p> <p>-CT data for UMZC T.692a</p> <p>-Photograph bank</p>
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