Sinosauropteryx prima

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Time: Early Cretaceous (~124 million years ago)

Region: Liaoning Province, China

Formation: Yixian Formation, Jehol Biota

Coloration Data

The dinosaur's coloration functioned as camouflage suited for open habitats, displaying countershading with a dark dorsum and a light venter. The tail was patterned with alternating, high-contrast dark and light bands, and a dark longitudinal stripe ran across the face through the eyes. However, the reddish-brown hue depicted in most artistic reconstructions remains hypothetical: this color was originally identified from a specimen that was reclassified in 2025 as Huadanosaurus.

Method: Analysis of the spatial distribution of dark feather impressions across three fossil slabs; fabrication of a full-scale 3D model of the dinosaur to evaluate shading patterns under different lighting environments.

Publications

• Fiann M. Smithwick, Robert Nicholls, Innes C. Cuthill, Jakob Vinther (2017)
  A study of the coloration of Sinosauropteryx prima.
• Arindam Roy, Michael Pittman, Evan T. Saitta, Thomas G. Kaye, Xing Xu (2020)
  An overview article on the paleo‑coloration of amniotes.
• Jakob Vinther (2015)
  An overview of methods for reconstructing paleo‑coloration.

Documents and files

• Smithwick_et_al_2017.pdf (PDF)
  Study confirming the banded tail in Sinosauropteryx prima and revealing a camouflage eye stripe.
• Roy_et_al_2020.pdf (PDF)
  Review article on amniote paleocolor in Biological Reviews of the Cambridge Philosophical Society.
• Vinther_2015.pdf (PDF)
  Review article on fossil color reconstruction.

Reconstructions

Fossils

Size comparison