New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes
Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the western border of Venezuela, where strata of the La Quinta Formation have yielded the ornithischian Laquintasaura venez...
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| Format: | Article |
| Language: | en_US |
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Royal Society
2016
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| Online Access: | http://hdl.handle.net/1721.1/101099 |
| _version_ | 1826208494146027520 |
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| author | Langer, Max C. Rincon, Ascanio D. Ramezani, Jahandar Solorzano, Andres Rauhut, Oliver W. M. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Langer, Max C. Rincon, Ascanio D. Ramezani, Jahandar Solorzano, Andres Rauhut, Oliver W. M. |
| author_sort | Langer, Max C. |
| collection | MIT |
| description | Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the western border of Venezuela, where strata of the La Quinta Formation have yielded the ornithischian Laquintasaura venezuelae and other dinosaur remains. Here, we report isolated bones (ischium and tibia) of a small new theropod, Tachiraptor admirabilis gen. et sp. nov., which differs from all previously known members of the group by an unique suite of features of its tibial articulations. Comparative/phylogenetic studies place the new form as the sister taxon to Averostra, a theropod group that is known primarily from the Middle Jurassic onwards. A new U–Pb zircon date (isotope dilution thermal-ionization mass spectrometry; ID-TIMS method) from the bone bed matrix suggests an earliest Jurassic maximum age for the La Quinta Formation. A dispersal–vicariance analysis suggests that such a stratigraphic gap is more likely to be filled by new records from north and central Pangaea than from southern areas. Indeed, our data show that the sampled summer-wet equatorial belt, which yielded the new taxon, played a pivotal role in theropod evolution across the Triassic–Jurassic boundary. |
| first_indexed | 2024-09-23T14:06:13Z |
| format | Article |
| id | mit-1721.1/101099 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T14:06:13Z |
| publishDate | 2016 |
| publisher | Royal Society |
| record_format | dspace |
| spelling | mit-1721.1/1010992022-09-28T18:31:07Z New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes Langer, Max C. Rincon, Ascanio D. Ramezani, Jahandar Solorzano, Andres Rauhut, Oliver W. M. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Ramezani, Jahandar Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the western border of Venezuela, where strata of the La Quinta Formation have yielded the ornithischian Laquintasaura venezuelae and other dinosaur remains. Here, we report isolated bones (ischium and tibia) of a small new theropod, Tachiraptor admirabilis gen. et sp. nov., which differs from all previously known members of the group by an unique suite of features of its tibial articulations. Comparative/phylogenetic studies place the new form as the sister taxon to Averostra, a theropod group that is known primarily from the Middle Jurassic onwards. A new U–Pb zircon date (isotope dilution thermal-ionization mass spectrometry; ID-TIMS method) from the bone bed matrix suggests an earliest Jurassic maximum age for the La Quinta Formation. A dispersal–vicariance analysis suggests that such a stratigraphic gap is more likely to be filled by new records from north and central Pangaea than from southern areas. Indeed, our data show that the sampled summer-wet equatorial belt, which yielded the new taxon, played a pivotal role in theropod evolution across the Triassic–Jurassic boundary. Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (Grant 2014/03835–3) Venezuelan Science, Technology, and Innovation Ministry (Project IVIC-1096) 2016-02-05T00:47:11Z 2016-02-05T00:47:11Z 2014-10 2014-07 Article http://purl.org/eprint/type/JournalArticle 2054-5703 http://hdl.handle.net/1721.1/101099 Langer, M. C., A. D. Rincon, J. Ramezani, A. Solorzano, and O. W. M. Rauhut. “New Dinosaur (Theropoda, Stem-Averostra) from the Earliest Jurassic of the La Quinta Formation, Venezuelan Andes.” Royal Society Open Science 1, no. 2 (October 1, 2014): 140184–140184. en_US http://dx.doi.org/10.1098/rsos.140184 Royal Society Open Science Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Royal Society Royal Society |
| spellingShingle | Langer, Max C. Rincon, Ascanio D. Ramezani, Jahandar Solorzano, Andres Rauhut, Oliver W. M. New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title | New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title_full | New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title_fullStr | New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title_full_unstemmed | New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title_short | New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes |
| title_sort | new dinosaur theropoda stem averostra from the earliest jurassic of the la quinta formation venezuelan andes |
| url | http://hdl.handle.net/1721.1/101099 |
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