Spiny Dragon Dinosaur: Haolong dongi Reveals New Insights into Dinosaur Skin

A newly identified dinosaur species, Haolong dongi, is offering scientists an unprecedented look at dinosaur skin, revealing a unique combination of scales and spikes. The 125-million-year-traditional fossil, discovered in northeastern China, is reshaping our understanding of dinosaur integument and potentially providing clues about defense mechanisms, sensory perception, and thermoregulation.

Discovery and Classification

The discovery of Haolong dongi was a collaborative effort between researchers from China’s Anhui Geological Museum and the Institute of Natural Sciences in Belgium. The Institute of Natural Sciences played a key role in analyzing the remarkably well-preserved fossil. Haolong dongi is classified as an iguanodontian, a group of plant-eating dinosaurs that thrived during the Early Cretaceous period. More specifically, it’s considered a basal hadrosauroid, placing it near the evolutionary base of the lineage that eventually led to the duck-billed dinosaurs.

Unique Skin Structure

What sets Haolong dongi apart is the exceptional preservation of its skin. The fossil exhibits large, overlapping scales on its tail and, notably, patches of skin covered in both long and short spikes. Everything Dinosaur reports that the variety and structure of these spikes are unlike anything previously observed in other dinosaur species. This gives the dinosaur a porcupine-like appearance.

Possible Functions of the Spikes

Scientists hypothesize that the spikes likely served multiple purposes. The primary function was likely defense against predators. However, researchers also suggest the spikes may have played a role in sensory perception or in regulating the dinosaur’s body temperature. Huang Jiandong of the Anhui Geological Museum noted that the study demonstrates dinosaur skin was far more complex than previously understood.

Significance of the Find

Pascal Godefroit of the Institute of Natural Sciences described the preservation of skin at the cellular level as extraordinary, providing a rare glimpse into the biology of an animal that lived over 100 million years ago. The Institute of Natural Sciences continues to be at the forefront of paleontological research, contributing significantly to our understanding of prehistoric life.

Recent Updates

On February 6, 2026, the Institute of Natural Sciences announced findings related to the “spiny dragon” revealing hidden secrets of dinosaur skin after 125 million years. On February 14th, 2026, the institute hosted a screening of the documentary “De dag dat het zonlicht niet meer scheen” in the presence of filmmakers and paleontologists.

Key Takeaways

• Haolong dongi is a new species of iguanodontian dinosaur discovered in China.
• The fossil exhibits exceptionally well-preserved skin with unique spikes and scales.
• The spikes likely served a defensive purpose, and potentially aided in sensory perception or thermoregulation.
• This discovery provides new insights into the complexity of dinosaur skin and evolution.