| Lessemsaurus Temporal range: Norian ~ | |
|---|---|
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Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | †Sauropodomorpha |
| Clade: | †Sauropoda |
| Clade: | †Lessemsauridae |
| Genus: | †Lessemsaurus Bonaparte 1999 |
| Species: | †L. sauropoides |
| Binomial name | |
| †Lessemsaurus sauropoides Bonaparte 1999 | |
Lessemsaurus is an extinct genus of sauropod dinosaur belonging to Lessemsauridae.
Naming and description
The type species, L. sauropoides, was formally described by José Fernando Bonaparte in 1999 in honor of Don Lessem, a writer of popular science books. It was found in the Los Colorados Formation of the Ischigualasto-Villa Unión Basin in La Rioja Province, Argentina.[1]
It was discovered in strata dating to the Norian stage, around 210 million years ago.[2][3] It is estimated to have reached 10–12 metres (33–39 ft) long and weighed over 7 metric tons (7.7 short tons), possibly up to 8–10 metric tons (8.8–11.0 short tons), in maximum body mass.[4][5][6][7]
Classification
A cladogram after Pol, Garrido & Cerda, 2011,[8] illustrates a possible placing of Lessemsaurus and Antetonitrus in Sauropodomorpha:
| Sauropodomorpha |
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In 2018, Apaldetti et al. recovered it as part of a clade they named Lessemsauridae, after Lessemsaurus. Their cladogram is reproduced below:[9]
| Sauropodiformes |
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The following cladogram shows the position of Lessemsaurus outside of Sauropoda, according to Oliver W. M. Rauhut and colleagues, 2020:[10]
| Massopoda |
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References
- ↑ Weishampel, David B; et al., 2004. "Dinosaur distribution (Late Triassic, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 527–528. ISBN 0-520-24209-2.
- ↑ Bonaparte, J. F. (1999). "Evolución de las vértebras presacras en Sauropodomorpha". Ameghiniana. 36: 115–187.
- ↑ Pol, D.; Powell, J. E. (2007). "New information on Lessemsaurus sauropoides (Dinosauria: Sauropodomorpha) from the Upper Triassic of Argentina". Special Papers in Palaeontology. 77: 223–243.
- ↑ Diego Pol; Alberto Garrido; Ignacio A. Cerda (2011). "A New Sauropodomorph Dinosaur from the Early Jurassic of Patagonia and the Origin and Evolution of the Sauropod-type Sacrum". PLOS ONE. 6 (1): e14572. Bibcode:2011PLoSO...614572P. doi:10.1371/journal.pone.0014572. PMC 3027623. PMID 21298087.
- ↑ Foelix, Rainer; Pabst, Ben; Kindlimann, René (2011). "Die Saurier in Frick" (PDF). Mitteilungen der aargauischen Naturforschenden Gesellschaft. 37. doi:10.5169/seals-283430.
- ↑ Apaldetti, C.; Martínez, R.N.; Cerda, I.A.; Pol, D.; Alcober, O. (2018). "An early trend towards gigantism in Triassic sauropodomorph dinosaurs". Nature Ecology & Evolution. 2 (8): 1227–1232. doi:10.1038/s41559-018-0599-y. hdl:11336/89332. PMID 29988169. S2CID 256705065.
- ↑ McPhee, Blair W.; Benson, Roger B.J.; Botha-Brink, Jennifer; Bordy, Emese M. & Choiniere, Jonah N. (2018). "A giant dinosaur from the earliest Jurassic of South Africa and the transition to quadrupedality in early sauropodomorphs". Current Biology. 28 (19): 3143–3151.e7. doi:10.1016/j.cub.2018.07.063. PMID 30270189.
- ↑ Diego Pol; Alberto Garrido; Ignacio A. Cerda (2011). "A New Sauropodomorph Dinosaur from the Early Jurassic of Patagonia and the Origin and Evolution of the Sauropod-type Sacrum". PLOS ONE. 6 (1): e14572. Bibcode:2011PLoSO...614572P. doi:10.1371/journal.pone.0014572. PMC 3027623. PMID 21298087.
- ↑ Apaldetti; Martínez, Ricardo N.; Cerda, Ignatio A.; Pol, Diego; Alcober, Oscar (2018). "An early trend towards gigantism in Triassic sauropodomorph dinosaurs". Nature Ecology & Evolution. 2 (8): 1227–1232. doi:10.1038/s41559-018-0599-y. hdl:11336/89332. PMID 29988169. S2CID 49669597.
- ↑ Rauhut, O. W. M.; Holwerda, F. M.; Furrer, H. (2020). "A derived sauropodiform dinosaur and other sauropodomorph material from the Late Triassic of Canton Schaffhausen, Switzerland". Swiss Journal of Geosciences. 113 (1): 8. doi:10.1186/s00015-020-00360-8. S2CID 220294939.
External links
Media related to Lessemsaurus at Wikimedia Commons
