Gilmoreosaurus
| Gilmoreosaurus | ||||||||||||
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Skeletal reconstruction of Gilmoreosaurus |
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| Temporal occurrence | ||||||||||||
| Upper Cretaceous ( Campanium ) | ||||||||||||
| 83.6 to 72 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Gilmoreosaurus | ||||||||||||
| Brett-Surmann , 1979 | ||||||||||||
| Art | ||||||||||||
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Gilmoreosaurus (" Gilmore's lizard") was a genus of bird basin dinosaurs from the group of Hadrosauridae . Fossil finds come from the late Upper Cretaceous ( Campanium ). Fossils of the type species T. mongoliensis were found in the Gobi desertin Inner Mongolia and described in 1933.
features
Gilmoreosaurus reached a body length of eight meters with a weight of two tons. This made it comparatively strong, but at the same time lighter than other hadrosaurs. As a very original hadrosaur, it resembled the Iguanodontidae or Iguanodon in its shape and especially in the formation of the hand claw . Especially on the hind legs it was characterized by large muscle attachment areas.
From gilmoreosaurus mongoliensis only items of a skull are known in G. atavus one even knows only individual teeth. More extensive material in the form of skull parts, vertebrae, ribs and pelvic parts is available from G. arkhangelskyi .
References
The first fossils of Gilmoreosaurus mongoliensis were found in 1933 in the Iren-Dabasu Formation near the city of Eren Hot in Inner Mongolia, People's Republic of China, in the Gobi Desert. As early as 1921, the American paleontologist Roy Chapman Andrews discovered the first dinosaur remains in this rich site .
In the Iren-Dabasu Formation, a number of other dinosaur skeletons were discovered in numerous excavations, including the theropods Alectrosaurus olseni and Archaeornithomimus asiaticus and Bactrosaurus johnsoni , another representative of the hadrosaurs. In the nearby Minhe Formation, which is also assigned to the Upper Cretaceous, other species were found, including the Velociraptor mongoliensis (Theropoda), the Protoceratopsids Microceratops gobiensis and Protoceratops andrewsi, as well as remains of unassigned theropods and sauropods.
Systematics
Gilmoreosaurus probably represents an early hadrosaur from the relatives of Telmatosaurus . There is also probably a closer relationship to the genera Claosaurus , Tanius and Secernosaurus , but a more precise assignment of these is currently not available due to the sparse material.
The type species Gilmoreosaurus mongoliensis was first discovered in 1933 by Charles W. Gilmore and described together with a number of other dinosaurs. He described it as Manchurosaurus mongoliensis , the rearrangement and first scientific description of the genus took place in 1979 by Michael K. Brett-Surman , who named it after Gilmore.
Depending on the source, up to three species are considered valid within the genus. In addition to the type species G. mongoliensis , the two species G. atavus (validity disputed, possibly a noun dubium ) and G. arkhangelskyi, described by Lev Alexandrovich Nessov in 1995 as part of a comprehensive revision of the Russian dinosaur finds, are added to the genus . G. kysylkumensis is considered together with Bactrosaurus kysylkumensis as a noun dubium.
literature
- David B. Weishampel , Peter Dodson , Halszka Osmólska (eds.): The Dinosauria . 1st paperback printing. University of California Press, Berkeley CA et al. 1992, ISBN 0-520-06727-4 .
Individual evidence
- ^ Gregory S. Paul : The Princeton Field Guide To Dinosaurs. Princeton University Press, Princeton NJ et al. 2010, ISBN 978-0-691-13720-9 , p. 295, online ( memento of the original of July 13, 2015 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. .
- ↑ a b after Weishampel et al. 1992; P. 556
- ↑ a b c d Gilmoreosaurus ( Memento from October 9, 2007 in the Internet Archive ), data sheet on Dinoruss.org.
- ↑ a b after Weishampel et al. 1992; P. 133
- ↑ according to Weishampel et al. 1992; P. 555
- ↑ Published as: Charles W. Gilmore : On the dinosaurian fauna of the Iren Dabasu Formation. In: Bulletin of the American Museum of Natural History. Vol. 67, Article 2, 1933, ISSN 0003-0090 , pp. 23-78, digital version (PDF; 15.35 MB) .
- ↑ Published as: Michael K. Brett-Surman: Phylogeny and palaegeography of hadrsaurian dinosaurs. In: Nature . Vol. 277, No. 5697, 1979, pp. 560-562, doi : 10.1038 / 277560a0 .
- ↑ Published as: Лев А. Несов: Динозавры Северной Евразии. новые данные о составе комплексов, экологии и палеобиогеографии. Санкт-Петербургский государственный университет, Санкт-Петербург 1995, digitized , (In English: Dinosaurs of Northern Eurasia online ). New data about assemblages (PDF , ecology and paleography 9 MB ).
