Lamessaurus Indicus – Wikipedia, free encyclopedia

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Lametasaurus indicus It is the only known species of the doubtful genre Lametasaurus (“Lagarto de Lameta”) of the ABELISÁURIDO TELEPODE DINOSAUR, which lived at the end of the Cretaceous period, 70 million years ago during the Maastrichtiense, in what is today an Indian subcontinent. His remains were found in the Lameta, Jabalpur, India formation. The type species is Lametasaurus indicus . It was originally indicated that it would be a possible paleontological chimera composed of many different animals. [ first ] ​

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Between October 1917 to 1919 Charles Alfred Matley found several fossils in his excavations near Jabalpur. [ 2 ] In 1921 he reported the discovery in the “Carnosaurs bed” of what he considered that there were two “megalyosaurs”, that is to say the thenopod dinosaurs. [ 3 ] In 1923/1924 he called one of these as the type species Lametasaurus indicus . The name of the genre refers to the Lameta formation, which dates from the time of the Maastrichtiense, while the name of the species is in reference to India. However, Matley did not identify him as a theropod, but as a member of Stegosauria, whose concept at that time also included the armored dinosaurs currently assigned to the Ankylosauria group; At first Matley considered it as a stegosaurus in the modern sense of the term and even tried to name it as a kind of gender Omosaur . [ 2 ] The holotype specimen consisted of some dermal shields, osteodermos, a sacral bone with at least five vertebrae, a pelvis, a lukewarm and teeth. [ 4 ] In 1933 Matley and Friedrich von Huene described some more complete remains collected by Barnum Brown, [ 2 ] Thinking that these would be part of a mace of the tail; [ 5 ] It would later be shown that it was actually a large osteoderm. [ 2 ] ​

On the other hand, in 1935 Dhirendra Kishore Chakravarti refuted this interpretation of the fossil as an armored dinosaur. He said it was a chimera that included the armor of a titanosaurus, crocodilian teeth and material of the thermal legs. [ 6 ] In 1964 Alfk Walker chose bone shields such as literacy, therefore excluding the teeth and bones of the holotype material. [ 7 ] The name Lametasaurus Now he only designated the shields and it was generally considered that they came from a member of the Nodosauridae family. As for the bones of the pelvis and legs, it was suggested in 2003 that they belonged to Rajasaurus . [ 8 ] EN 2008 Matthew Carrano et al . They ruled out the possibility that the shields were from an anquilosour, establishing that they could probably be a titanosaurus or perhaps of a abelisáurido. If this last case is correct, the species would not have been in principle a chimera and it would be a possible older synonym of Indosaurus I Rajasaurus . [ 9 ] ​

The holotype material has been lost, lacking a known catalog number, which makes it difficult to evaluate the different hypotheses. Taxon is therefore commonly considered as a The name is no doubt (doubtful name). [ ten ] ​

References [ To edit ]

  1. ↑ Bervoets, Fred. “Lametasaurus indicus» . Dino data. Filed from the original March 17, 2013 . Retrieved on April 23, 2012 .
  2. ↑ a b c d Carrano, M.T., J.A. Wilson, P. M. Barrett, 2010, “The history of dinosaur collecting in central India since 1828”, In: Moody, R.T.J., E. Buffetaut, D. Naish, and D. M. Martill (eds.), Dinosaurs and Other Extinct Saurians: A Historical Perspective . Geological Society, London, Special Publications 343 : 161–173
  3. ↑ Matley, C.A., 1921, “On the stratigraphy, fossils and geological relationships of the Lameta beds of Jubbulpore”, Records of the Geological Survey of India 53 : 142–169
  4. ↑ Matley, C.A., 1923, “Note on an armoured dinosaur from the Lameta beds of Jubbulpore”, Records of the Geological Survey of India , 55 : 105-109
  5. ↑ Huene, F. von, & Matley, C.A., 1933, “The Cretaceous Saurischia and Ornithischia of the central provinces of India”, Indicate Palaeontologia , 21 : 1–74
  6. ↑ Chakravarti, D. K., 1935, “is Lametasaurus indicus an armored dinosaur?”, American Journal of Science 30 (5): 138-141
  7. ↑ Walker, A., 1964, “Triassic reptiles from the Elgin area: Ornithosuchus and the origin of carnosaurs”, Philosophical Transactions of the Royal Society of London B 248 : 53-134
  8. ↑ J.A. Wilson, P.C. Sereno, S. Srivastava, D.K. Bhatt, A. Khosla and A. Sahni, 2003, “A new abelisaurid (Dinosauria, Theropoda) from the Lameta Formation (Cretaceous, Maastrichtian) of India”, Contributions from the Museum of Paleontology, University of Michigan thirty first (1): 1-42
  9. ↑ M.T. Carrano and S.D. Sampson, 2008, “The phylogeny of Ceratosauria (Dinosauria: Theropoda)”, Journal of Systematic Palaeontology 6 (2): 183-236
  10. ↑ F.E. Novas, S. Chatterjee, D.K. Rudra and P.M. Datta, 2010, ” Rahiolisaurus gujaratensis , n. gen. n. sp., a new abelisaurid theropod from the Late Cretaceous of India”. In: S. Badyopadhyay (ed.), New Aspects of Mesozoic Biodiversity . Lecture Notes in Earth Sciences 132, pp. 45-62

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