Sauropodomorph dinosaur genus from Late Triassic Argentina
Lessemsaurus extinct genus ofsauropodiform dinosaur belonging toLessemsauridae .
Naming and description [ edit ] Thetype species ,L. sauropoides , was formally described byJosé Fernando Bonaparte in 1999 in honor ofDon Lessem , a writer of popular science books. It was found in theLos Colorados Formation of theIschigualasto-Villa Unión Basin inLa Rioja Province, Argentina .[ 1]
It was discovered in strata dating to theNorian stage , around 210 million years ago.[ 2] [ 3] [ 4] [ 5] [ 6] [ 7]
Exhibit in Singapore Acladogram after Pol, Garrido & Cerda, 2011,[ 8] Lessemsaurus andAntetonitrus
In 2018, Apaldettiet al. recovered it as part of aclade they namedLessemsauridae , afterLessemsaurus . Their cladogram is reproduced below:[ 9]
The following cladogram shows the position ofLessemsaurus outside of Sauropoda, according to Oliver W. M. Rauhut and colleagues, 2020:[ 10]
^ 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 onLessemsaurus 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.Bibcode :2018NatEE...2.1227A .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.Bibcode :2018CBio...28E3143M .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.Bibcode :2018NatEE...2.1227A .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" (PDF) .Swiss Journal of Geosciences 113 (1): 8.doi :10.1186/s00015-020-00360-8 S2CID 220294939 .
Topics in sauropodomorph research
Media related toLessemsaurus at Wikimedia Commons
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