1,721,232 research outputs found
Sauropods from the Early Jurassic of South America and the Radiation of Eusauropoda
No full textEusauropods are large-bodied and long-necked dinosaurs that dominated the role of large herbivores in terrestrial ecosystems since at least the late Early Jurassic (Pliensbachian-Toarcian). Their early diversification is best recorded in South America where the best-preserved eusauropods and close relatives from this period of time have been found. The earliest sauropod from the Jurassic of South America is Amygdalodon patagonicus from the Cerro Carnerero Formation (Pliensbachian?early Toarcian), and its fragmentary remains suggest a position at the base of Gravisauria or as closely related to this clade. The Cañadón Asfalto Formation (middle late Toarcian) has provided three named sauropods, although a higher diversity of sauropods may have existed. These are the basal eusauropod Patagosaurus fariasi, known from multiple specimens, the much more incompletely known early sauropod Volkheimeria chubutensis, and Bagualia alba that is known from multiple specimens and includes fairly complete craniomandibular remains. These taxa provide the earliest evidence of ecological predominance by large-bodied sauropods and are therefore significant for understanding the rise and success of this group in the Jurassic Period. The current knowledge of these sauropods from the late Early Jurassic of South America indicates that the evolutionary radiation of Eusauropoda occurred at least by the mid-Toarcian, subsequent to a large-scale volcanic event in the Southern Hemisphere that has been linked to global climatic change and the rise of conifers as the predominant components of Jurassic seasonal forests.Fil: Pol, Diego. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Gomez, Kevin Leonel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; ArgentinaFil: Holwerda, Femke Marleen. Royal Tyrrell Museum Of Palaeontology; CanadáFil: Rauhut, Oliver W. M.. Bayerische Staatssammlung für Paläontologie und Geologie; AlemaniaFil: Carballido, José Luis. Museo Paleontológico Egidio Feruglio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Fig. 14 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 14. Lower jaws of the holotype of Zosuchus davidsoni IGM 100/1305 in lateral view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 19, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 9 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 9. Posterior region of skull of specimen IGM 100/1306 in lateral view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 13, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 11 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 11. Palatal region specimen of IGM 100/1306 in posterodorsal view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 14, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 15 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 15. Strict consensus of the six most parsimonious hypotheses obtained with Nona.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 21, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 3 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 3. Skull of the holotype of Zosuchus davidsoni IGM 100/1305 in dorsal view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 5, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 10 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 10. Skull of specimen IGM 100/1306 in occipital view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 14, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 12 in A New Crocodyliform from Zos Canyon, Mongolia
No full textFig. 12. Posterior region of skull of specimen IGM 100/1306 in ventral view.Published as part of POL, DIEGO & NORELL, MARK A., 2004, A New Crocodyliform from Zos Canyon, Mongolia, pp. 1-36 in American Museum Novitates 3458 on page 15, DOI: 10.1206/0003-0082(2004)4582.0.CO;2, http://zenodo.org/record/538238
Fig. 6 in A New Gobiosuchid Crocodyliform Taxon from the Cretaceous of Mongolia
No full textFig. 6. Ventral surface of the postorbital of Zaraasuchus shepardi IGM 100/1321.Published as part of <i>POL, DIEGO & NORELL, MARK A., 2004, A New Gobiosuchid Crocodyliform Taxon from the Cretaceous of Mongolia, pp. 1-32 in American Museum Novitates 3458</i> on page 9, DOI: 10.1206/0003-0082(2004)458<0001:ANGCTF>2.0.CO;2, <a href="http://zenodo.org/record/10112850">http://zenodo.org/record/10112850</a>
Fig. 11 in A New Gobiosuchid Crocodyliform Taxon from the Cretaceous of Mongolia
No full textFig. 11. Strict consensus of the two most parsimonious hypotheses obtained with Nona.Published as part of <i>POL, DIEGO & NORELL, MARK A., 2004, A New Gobiosuchid Crocodyliform Taxon from the Cretaceous of Mongolia, pp. 1-32 in American Museum Novitates 3458</i> on page 16, DOI: 10.1206/0003-0082(2004)458<0001:ANGCTF>2.0.CO;2, <a href="http://zenodo.org/record/10112850">http://zenodo.org/record/10112850</a>
- …
