Dryptosauroides
| Dryptosauroides | ||||||||||
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| Temporal occurrence | ||||||||||
| Upper Cretaceous ( Maastrichtian ) | ||||||||||
| 72 to 66 million years | ||||||||||
| Locations | ||||||||||
| Systematics | ||||||||||
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| Scientific name | ||||||||||
| Dryptosauroides | ||||||||||
| Huene & Matley , 1933 | ||||||||||
| Art | ||||||||||
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Dryptosauroides is a dubious (dubious) genus of theropod dinosaurs from the Upper Cretaceous ( Maastrichtian ) India . It is known only from a few vertebral and rib fragments that were discovered near the city of Jabalpur in the layers of the Lameta Formation . Today Dryptosauroides is classified within the Ceratosauria . The only species is Dryptosauroides grandis .
features
Six fragmentary vertebrae, one cervical vertebra and four fragmentary ribs are known. The vertebrae originate from the back of the trunk, since the vertebral bodies did not show any pleurocoeles (lateral cavities). Overall, the bones follow the blueprint that is typical for representatives of the Abelisauridae .
Systematics
Initially, Dryptosauroides was considered a representative of the Coelurosauria . Novas (2004) showed that it was a representative of the Ceratosauria, which can possibly be classified within the Abelisauroidea .
Research history, naming and validity
Dryptosauroides was described in 1933 by the paleontologists Friedrich von Huene and Charles Matley ; the finds come from the layers of the Lameta formation near the city of Jabalpur . The name Dryptosauroides means something like " Dryptosaurus -like"; von Huene and Matley chose this name because they found similarities with the genus Dryptosaurus .
Since the fossils do not show any characteristics that allow a differentiation from other genera, Dryptosauroides is now regarded as the noun dubium . Dryptosauroides joins more than half a dozen genera of the Abelisauroidea, which were described from the Lameta formation. Since the bones were rarely found in context, but mostly isolated, and since a large part of these fossils has been lost today, these genera cannot be differentiated from one another in a meaningful way. For example, the bone material described as Dryptosauroides , Coeluroides , Lametasaurus , Indosuchus , Indosaurus , Ornithomimoides mobilis, and Rajasaurus probably belonged to only one or two different genera.
Individual evidence
- ^ A b Timothy B. Rowe , Jacques Gauthier : Ceratosauria. In: David B. Weishampel , Peter Dodson , Halszka Osmólska (eds.): The Dinosauria . University of California Press, Berkeley CA et al. 1990, ISBN 0-520-06726-6 , pp. 151-168.
- ↑ a b Ronald S. Tykoski, Timothy Rowe: Ceratosauria. In: David B. Weishampel, Peter Dodson, Halszka Osmólska (eds.): The Dinosauria . 2nd edition. University of California Press, Berkeley CA et al. 2004, ISBN 0-520-24209-2 , pp. 47-70, here p. 50.
- ^ A b Matthew T. Carrano, Scott D. Sampson: The Phylogeny of Ceratosauria (Dinosauria: Theropoda). In: Journal of Systematic Palaeontology. Vol. 6, No. 2, 2008, ISSN 1477-2019 , pp. 183-236, here p. 202, doi : 10.1017 / S1477201907002246 .
- ↑ Friedrich Frh. Von Huene : The fossil reptile order Saurischia, their development and history (= monographs on geology and palaeontology. Series 1, volume 4, part 1, ZDB -ID 634428-8 ). Borntraeger, Leipzig 1932, p. 298.
- ↑ Fernando E. Novas , Federico L. Agnolin, Saswati Bandyopadhyay: Cretaceous theropods from India: A review of specimens described by Huene and Matley (1933). In: Revista del Museo Argentino de Ciencias Naturales. NS Vol. 6, No. 1, 2004, ISSN 1514-5158 , pp. 67-103, digitized version (PDF; 78.62 kB) ( Memento of the original from October 7, 2012 in the Internet Archive ) Info: The archive link was automatically used and not yet tested. Please check the original and archive link according to the instructions and then remove this notice. .
- ^ Friedrich Baron von Huene, Charles Alfred Matley: The Cretaceous Saurischia and Ornithischia of the Central Provinces of India (= Geological Survey of India. Palaeontologia Indica. NS Vol. 21, No. 1, ISSN 0970-0528 ). Manager of Publication, Delhi 1933.
- ↑ Ben Creisler: Dinosauria Translation and Pronunciation Guide. Archived from the original ; accessed on August 5, 2014 .
