Meet Jian changmaensis: The Four-Winged Dinosaur That Stalked Ancient China's Skies

When and Where Did It Live?

The single known fossil of Jian changmaensis was unearthed from the Xiagou Formation in the Changma Basin of northwestern Gansu Province, China. This geological formation dates to the Early Cretaceous period, specifically the Aptian stage, making the fossil approximately 124 to 120 million years old .

The discovery is monumental because the Xiagou Formation has yielded more than 100 specimens of Early Cretaceous birds but, until now, had produced zero non-avian dinosaur body fossils. The holotype specimen, cataloged as GSGM-D050, consists of an articulated left pectoral girdle and partial forelimb—enough to confirm the animal’s identity and its place in the dinosaur family tree .

The research was led by Ling-Qi Zhou, Jingmai K. O’Connor, and colleagues, and was formally published in the Annals of Carnegie Museum in June 2026 .

Key Physical Features

The most striking feature of Jian changmaensis is its inferred four-winged (tetrapteryx) configuration. The fossil preserves attachment sites that indicate elongated, pennaceous feathers grew on both its front and hind limbs. These feather structures were not just ornamental; they likely formed airfoils used for gliding . While the specimen is missing its wrist and hand, the preserved arm bones—including a humerus fragment roughly 10 cm (4 inches) long—point to a relatively large animal for a microraptor .

Although much about its appearance is inferred from its close relatives, paleoartists have depicted it as a dragon-like predator covered in plumage, a stark contrast to the scaly, reptilian image of velociraptors popularized by cinema .

Evolutionary Relationships

Phylogenetic analysis firmly places Jian changmaensis within Microraptorinae, a subfamily of dromaeosaurid theropods. These animals are among the closest known non-avian relatives of modern birds . The analysis specifically recovers Jian as a basal member of the microraptorine clade, which has significant implications. It expands the definitive geographic record of this group to include northwestern China and provides fresh morphological data on the early evolution of the lineage that gave rise to four-winged gliders like the iconic Microraptor .

How Did It Glide and Hunt?

Jian changmaensis almost certainly could not achieve powered flight. Instead, like other microraptorines, it probably used its four feathered limbs to glide from tree to tree in a squirrel-like manner . This arboreal lifestyle would have made it a formidable canopy predator.

Scientists hypothesize that Jian changmaensis directly preyed upon the early birds that lived alongside it, specifically Gansus yumenensis, an ancient avian whose fossils are abundant at the same site. This makes Jian changmaensis a rare non-avian dinosaur that likely occupied an apex-predator niche in its ecosystem, actively hunting early avialans from the trees . This ecological relationship provides a direct link between the world of dinosaurs and the world of the first birds.

Why This Fossil Site Is So Important

For years, the Changma Basin was a paradox: a lake-shore forest ecosystem brimming with the fossils of early birds, yet apparently devoid of the dinosaurs they evolved from. Jian changmaensis breaks that pattern entirely .

"It’s the only dinosaur found at this site that wasn’t a bird, it was a carnivore, and it was much bigger than everything else that we’ve found there," said Jingmai O’Connor, one of the study’s co-authors . The presence of a raptor-like predator at the site finally allows paleontologists to reconstruct the full ecological dynamics of the region. It is no longer just a refuge for early birds; it was a complex ecosystem where the hunter and the hunted were both pushing the boundaries of flight.