A fossilized skeleton discovered in northeastern China is providing new evidence that flight-related traits evolved independently in distinct dinosaur lineages. The specimen, named Norellraptor barsboldi, was recovered from the Jiufotang Formation near Lamadong Town in western Liaoning. It represents a small, feathered dinosaur belonging to the microraptorine group, which sits close to the evolutionary branch that gave rise to birds.
The Discovery
The fossil is a nearly complete skeleton measuring roughly 57 centimeters (22.4 inches) long. Traces of preserved plumage were found alongside the bones, including probable asymmetrical flight feathers near the hands as well as feathers surrounding the tail and hind limbs. Skeletal fusion and bone development reveal that the animal had progressed beyond its earliest juvenile stage before its death. The exact geological age of the specimen is Not specified in the source; please check the official notice.
What Scientists Found
Researchers examined the physical structure and bone development of Norellraptor barsboldi, noting several key features:
- The dinosaur possessed a lightweight build, specialized hands and feet, and anatomical adaptations designed for aerial movement.
- Microscopic analysis of its radius bone demonstrated an unusual growth pattern with periods where development halted and subsequently resumed, distinguishing it from some related dinosaurs.
- About 30% of the distinctive physical traits identified in microraptorines also appeared independently in the bird lineage.
- The chronological order of anatomical changes differed between the groups; microraptorines modified their fingers early while altering their wrists, chests, and upper arms later, unlike the sequence observed in early birds.
Why It Matters
This structural mismatch indicates that four-winged microraptorines did not share a single flying ancestor with birds or follow the exact same developmental path toward flight. Instead, the necessary anatomy for aerial movement was gained gradually through a distinct evolutionary route. Positioned close to Zhongjianosaurus on the microraptorine family tree, Norellraptor highlights how multiple independent evolutionary pressures shaped flight capabilities across paravians, the wider group comprising birds and their closest dinosaur relatives.
Source: dinosaur fossil discovery - BingNews · Published October 01, 2026