By Dean Murray via SWNS
The discovery of a “parrot lizard” fossil could explain how dinosaurs developed feathers.
Paleontologists at University College Cork (UCC) 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.
Psittacosaurus is often referred to as a “parrot lizard” due to its short skull and beak that superficially resemble those of modern parrots.
The study, published in Nature Communications, describes ‘zoned development’ in dinosaur skin, with zones of reptile-style scales and zones of bird-like skin with feathers.
The research was led by UCC paleontologists Dr. Zixiao Yang and Professor Maria McNamara of UCC’s School of Biological, Earth and Environmental Sciences, along with scientists based in Nanjing University in 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.”
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.
“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.”
