Echinodon
| Echinodon | ||||||||||
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The dental , tooth-bearing bone of the lower jaw, from Echinodon (scale 1 cm) |
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| Temporal occurrence | ||||||||||
| Upper Jurassic to Lower Cretaceous ( Tithonian to Berriasian ) | ||||||||||
| 152.1 to 139.3 million years | ||||||||||
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| Systematics | ||||||||||
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| Scientific name | ||||||||||
| Echinodon | ||||||||||
| Owen , 1861 | ||||||||||
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Echinodon ("thorn tooth") is a genus of bird basin dinosaurs (Ornithischia), the exact systematic position of which has not been clarified. Echinodon was first described by Richard Owen in 1861,who placed it among the lizards .
The fossils date from the turn of the Upper Jurassic to the Lower Cretaceous ( Tithonian to Berriasian ) in England. The two-legged dinosaur reached a length of about 60 centimeters. So far, isolated skull fragments of three individuals have been found, including parts of the jaw and teeth. Unlike most other ornithicals, Echinodon had one or two teeth in the upper jaw that were shaped like canines (caniniform).
Echinodon has been assigned to different dinosaur taxa in the history of research . He was described as a fabrosaur or as an original ornithic. Based on skin bones found near the bones, it was also believed to be a representative of the original Thyreophora (a group of armored ornithic animals), but the elements were later recognized as turtle osteoderms . The 1991 classification of Echinodon as a heterodontosaurid by Paul C. Sereno was controversial, but it was confirmed in a joint study by Norman and Barret in 2002 - albeit for a different reason . If this view is confirmed, this genus would be considerably younger than other Heterodontosauridae.
literature
- Richard Owen: Monograph on the fossil Reptilia of the Wealden and Purbeck Formations. Part 5: Lacertilia (Nuthetes, & c.), [Purbeck]. Palaeontographical Society, London 1861, pp. 31-39, digitized .
- Paul C. Sereno: Lesothosaurus, "Fabrosaurids," and the early evolution of Ornithischia. In: Journal of Vertebrate Paleontology. Vol. 11, No. 2, 1991, ISSN 0272-4634 , pp. 168-197, doi : 10.1080 / 02724634.1991.10011386 .
