Dysalotosaurus ( lat. , Literally - elusive lizard) - a genus of herbivorous dinosaurs from the family of driosaurids of the iguanodont clade. Fossil remains were found in the Upper Kimmeridge formations (Upper Jurassic , 155.7–150.8 million years ago [1] ) of the Tendaguru Formation , Tanzania . Typical and only species Dysalotosaurus lettowvorbecki .
| † Dysalotosaurus |
Skeleton reconstruction at the Berlin Museum of Natural History |
| Scientific classification |
|---|
| No rank : | Bilateral symmetrical |
| Infraclass : | Archosauromorphs |
| No rank : | Archosauriformes |
| Infrastructure : | † Ornithopods |
| Parvotryad : | † Iguanodonts |
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| International scientific name |
|---|
Dysalotosaurus Virchow , 1919 |
| Single view |
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† Dysalotosaurus lettowvorbecki
Virchow, 1919 |
Geochronology155.7-150.8 Ma | million years | Period | Era | Aeon |
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| 2,588 | Even | | | Ka | F
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th | | 23.03 | Neogene | | 66.0 | Paleogen | | 145.5 | a piece of chalk | M
e
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th | | 199.6 | Yura | | 251 | Triassic | | 299 | Permian | P
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e
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th | | 359.2 | Carbon | | 416 | Devonian | | 443.7 | Silur | | 488.3 | Ordovician | | 542 | Cambrian | | 4570 | Precambrian |
◄ Nowadays◄ Cretaceous-Paleogene extinction◄ Triassic extinction◄ Mass Permian Extinction◄ Devonian extinction◄ Ordovician-Silurian extinction◄ Cambrian explosion |
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The species was named by the German biologist Rudolf Virchow in 1919 in honor of Paul von Lett-Forbeck, officer of the army of the German Empire . Previously, the validity of the genus was questioned, and it was reckoned to be related to Dryosaurus , but recent studies reject this synonymy [2] [3] .
Reconstructed skeleton of
DysalotosaurusContent
Dysalotosaurus was a brood dinosaur that survived puberty at the age of ten, had an indeterminate growth structure, and maximum growth rates comparable to those of a large kangaroo [4] .
Brain Research
In 2013, paleontologists Stefan Lautenschlager and Tom Hubner from the University of Bristol conducted a study of the brain and inner ear of two Dysalotosaurus individuals: a young three-year-old specimen and an adult 12-year-old. Using CT scans and 3D computer visualization, scientists were able to reconstruct the brain and inner ear of both samples. Looking at the brain and the internal anatomy of the ear, the researchers found that the Dysalotosaurus brain underwent significant changes in the growth process - most likely as a reaction to the environment and metabolic needs. Nevertheless, the important parts responsible for the sense of hearing and cognitive processes were already well developed in the young individual. This study has important implications for understanding how dinosaur brains worked [5] .
In 2011, paleontologists Florian Witzmann and Oliver Humpe from the Berlin Museum of Natural History and their colleagues found that the deformation of some of the bones of Dysalotosaurus was probably caused by a viral infection similar to Paget's disease . These are the oldest traces of a viral infection known to science [6] .
- ↑ Dysalotosaurus . Paleobiology Database Classic . (Retrieved August 2, 2016) .
- ↑ Tom R. Hübner, Oliver WM Rauhut. A juvenile skull of Dysalotosaurus lettowvorbecki (Ornithischia: Iguanodontia), and implications for cranial ontogeny, phylogeny, and taxonomy in ornithopod dinosaurs (English) // Zoological Journal of the Linnean Society : journal. - Oxford University Press , 2010. - Vol. 160 , no. 2 . - P. 366-396 . - DOI : 10.1111 / j.1096-3642.2010.00620.x .
- ↑ McDonald AT, Kirkland JI , DeBlieux DD, Madsen SK, Cavin J. New Basal Iguanodonts from the Cedar Mountain Formation of Utah and the Evolution of Thumb-Spiked Dinosaurs (English) // PLOS One : journal. - Public Library of Science , 2010. - Vol. 5 , no. 11 . - P. e14075 . - DOI : 10.1371 / journal.pone.0014075 . - PMID 21124919 .
- ↑ Hübner TR Bone Histology in Dysalotosaurus lettowvorbecki (Ornithischia: Iguanodontia) - Variation, Growth, and Implications (English) // PLOS One : journal / Laudet, Vincent. - Public Library of Science , 2012. - Vol. 7 , no. 1 . - P. e29958 . - DOI : 10.1371 / journal.pone.0029958 . - PMID 22238683 .
- ↑ Fossil brain teaser: New study reveals patterns of dinosaur brain development (neopr.) . Date of treatment July 31, 2016.
- ↑ Witzmann, F., Claeson, KM, Hampe, O., Wieder, F., Hilger, A., Manke, I., Niederhagen, M., Rothschild, BM & Asbach, P. (2011). Paget disease of bone in a Jurassic dinosaur. Current Biology 21 (17): R647 — R648 DOI : 10.1016 / j.cub. 2011.08.006.
