June 3rd, 2024 
Riffin @WFS,World Fossil Society, Athira, Riffin T Sajeev, Russel T Sajeev
Palaeontologists at University College Cork (UCC) in Ireland have discovered that some feathered dinosaurs had scaly skin like reptiles today, thus shedding new light on the evolutionary transition from scales to feathers.
The researchers studied a new specimen of the feathered dinosaur Psittacosaurus from the early Cretaceous (135-120 million years ago), a time when dinosaurs were evolving into birds. The study shows, for the first time, that Psittacosaurus had reptile-like skin in areas where it didn’t have feathers.
The specimen under natural light (a) and UV light (b) showing distinct fluorescence hues for bone (cyan) and soft tissues (yellow) against a dark purple sedimentary matrix.
The study, published today in Nature Communications, was led by UCC palaeontologists Dr Zixiao Yang and Prof. Maria McNamara of UCC’s School of Biological, Earth and Environmental Sciences, who teamed with scientists based in Nanjing University (China).
The team used ultraviolet (UV) light to identify patches of preserved skin, which are invisible in natural light. Further investigation of the fossil skin using X-rays and infrared light revealed spectacular details of preserved cellular structure.
Dr Yang says:
“The fossil truly is a hidden gem. The fossil skin is not visible to the naked eye, and it remained hidden when the specimen was donated to Nanjing University in 2021. Only under UV light is the skin visible, in a striking orange-yellow glow.
“What is really surprising is the chemistry of the fossil skin. It is composed of silica — the same as glass. This type of preservation has never been found in vertebrate fossils. There are potentially many more fossils with hidden soft tissues awaiting discovery.”
The most exciting aspect of the discovery, however, is what it tells us about the evolution of feathers in dinosaurs. Prof. McNamara, senior author on the study, says:
“The evolution of feathers from reptilian scales is one of the most profound yet poorly understood events in vertebrate evolution. While numerous fossils of feathers have been studied, fossil skin is much more rare.
Plan view of the fossil surface (a, under UV light) and a fractured vertical section (b and c, under natural light and UV light, respectively) of the fossil skin (sampling location shown in Fig. 2g). Arrowheads in a and b indicate the same position on the rib bone. d–g Scanning electron micrographs of the fossil skin showing a layered structure with individual layers that are fragmented laterally. Close-up of the region indicated in g (h) with interpretive drawing (i) highlighting a single sublayer (dark grey in i) with tapering lateral tips; light grey shading in i denotes over- and underlying sublayers and dashed lines denote fractures.
“Our discovery suggests that soft, bird-like skin initially developed only in feathered regions of the body, while the rest of the skin was still scaly, like in modern reptiles. This zoned development would have maintained essential skin functions, such as protection against abrasion, dehydration and parasites. The first dinosaur to experiment with feathers could therefore survive and pass down the genes for feathers to their offspring.”
The Psittacosaurus specimen NJUES-10 is currently housed in Nanjing University.
Journal Reference:Zixiao Yang, Baoyu Jiang, Jiaxin Xu, Maria E. McNamara. Cellular structure of dinosaur scales reveals retention of reptile-type skin during the evolutionary transition to feathers. Nature Communications, 2024; 15 (1) DOI: 10.1038/s41467-024-48400-3
@WFS,World Fossil Society, Athira, Riffin T Sajeev, Russel T Sajeev
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