Sinosauropteryx

genus of reptiles (fossil)

Sinosauropteryx is a genus of non-avialan dinosaur (not a bird).

Sinosauropteryx
Temporal range: Lower Cretaceous
Sinosauropteryxfossil.jpg
Scientific classification
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Sinosauropteryx

Ji & Ji, 1996
Species
  • S. prima Ji & Ji, 1996 (type)

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]

ColourEdit

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]

ReferencesEdit

  1. Zhou, Z (2006). "Evolutionary radiation of the Jehol Biota: chronological and ecological perspectives". Geological Journal (41): 377–393.
  2. 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.
  3. Longrich, N. 2002. Systematics of Sinosauropteryx. Journal of Vertebrate Paleontology, 22(3): 80A.
  4. BBC News