Sinosauropteryx
Sinosauropteryx is a genus of non-avialan dinosaur (not a bird).
| Sinosauropteryx Temporal range: Lower Cretaceous
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| Genus: | †Sinosauropteryx Ji & Ji, 1996
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It is the first one found with the fossilized impressions of furry down or filamentous feathers. Overall, the filaments resemble the down-like feathers of some modern flightless birds.
Sinosauropteryx lived in China during the early Cretaceous period and was a close relative of Compsognathus. It has been dated to 124.6–122 million years ago.[1]
The fossils were from the famous Jehol biota of Sihetun, Liaoning Province, China, and represent an ancient lake bed.
Most paleontologists do not consider Sinosauropteryx to be a bird, because phylogenetically, it lies far from the clade Aves, usually defined as Archaeopteryx plus modern birds.
Sinosauropteryx prima is among the smallest known non-avian theropods, with the type specimen (a nearly mature individual) measuring only 68 cm (27 in) in length, including a very long tail.[2]
Colour
Paleontologist Nick Longrich suggested that these specimens preserve remnants of the original colour pattern the animal would have had in life. He argued that the dark, banded stains on the tail were too evenly spaced to have been caused by random separation of the fossil slabs, and that they represent fossilized pigments present in the feathers.
The presence of dark feathers along only the top of the body may also reflect the colour pattern in life, indicating that Sinosauropteryx prima was countershaded with dark colour on its back and lighter colour on its underside, with bands or stripes on the tail for camouflage.[3] The main colour turned out later to be ginger.[4]
Sinosauropteryx Media
Size of adult and sub-adult specimens, compared with a human
Holotype and referred specimen with diagrams showing feathers and internal tissue
Preserved plumage in various specimens
Restoration illustrating colouration as suggested by the study of preserved melanosomes
Skeletal diagram showing known remains of the holotype and a referred specimen
Counter slab of the holotype, on display at the Geological Museum of China
Undescribed fossil specimen at the Hong Kong Science Museum
Cast of the skeleton belonging to GMV 2124, which is probably not a Sinosauropteryx
Restoration of Sinosauropteryx preying on Dalinghosaurus, by Bob Nicholls
References
- ↑ Zhou, Z (2006). "Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives". Geological Journal (41): 377–393.
- ↑ Chen, Pei-ji; Dong, Zhi-Ming; Zhen, Shuo-nan (1998). "An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China". Nature. 391 (8): 147–152. Bibcode:1998Natur.391..147C. doi:10.1038/34356. S2CID 4430927.
- ↑ Longrich, N. 2002. Systematics of Sinosauropteryx. Journal of Vertebrate Paleontology, 22(3): 80A.
- ↑ BBC News