Coeluroides

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Coeluroides
Temporal occurrence
Upper Cretaceous ( Maastrichtian )
72 to 66 million years
Locations
Systematics
Dinosaur (dinosauria)
Lizard dinosaur (Saurischia)
Theropoda
Ceratosauria
Coeluroides
Scientific name
Coeluroides
Huene & Matley , 1933
Art
  • Coeluroides largus

Coeluroides is a dubious (dubious) genus of theropod dinosaurs from the Upper Cretaceous ( Maastrichtian ) India . It is known only from isolated, fragmentary eddies that were discovered near the city of Jabalpur in the layers of the Lameta Formation . Today Coeluroides is classified within the Ceratosauria . The only species is Coeluroides largus .

features

Four dorsal vertebrae and a single caudal vertebra are known. These fossils belonged to a medium-sized theropod, believed to have been similar in size to the contemporary genera Indosuchus and Indosaurus . Compared to other representatives of the Ceratosauria, the base of the spinous processes was elongated. The transverse processes were roughly triangular when viewed from above.

Systematics

At first Coeluroides was considered a representative of the Coelurosauria . A possible position within the Carnosauria was later discussed. Novas (2004) showed that it was a representative of the Ceratosauria, which can possibly be classified within the Abelisauroidea . Carrano and Sampson (2008) indicate that the size of the fossils and the proportions of the tail vertebrae found a provisional status within a abelisauridae permit.

Research history, naming and validity

Coeluroides 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 Coeluroides ( gr. Koilos "hollow"; gr. Oura "tail"; -oides - "similar") means something like " Coelurus -like", as this animal was initially thought to be a representative of the Coelurosauria .

Since the fossils do not show any characteristics that allow a differentiation from other genera, Coeluroides is now considered a noun dubium . Coeluroides joins more than half a dozen genera of the Abelisauroidea, which have been 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 Coeluroides , Lametasaurus , Dryptosauroides , Indosuchus , Indosaurus , Ornithomimoides mobilis, and Rajasaurus probably belonged to only one or two different genera.

Individual evidence

  1. ^ 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.
  2. ↑ 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.
  3. ^ A b c 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 .
  4. ↑ 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.
  5. ↑ a b Ben Creisler: Dinosauria Translation and Pronunciation Guide. Archived from the original ; accessed on August 5, 2014 .
  6. ↑ 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. . @1@ 2Template: Webachiv / IABot / www.macn.secyt.gov.ar
  7. ^ 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.