Breakthrough Tracker record
A Jurassic avialan broadens the earliest known flight ecology
Xu and collaborators describe Yuezhuornis yangyuanensis from a partial Upper Jurassic skeleton and infer from its short forelimbs, long hindlimbs and related anatomy that it was a terrestrial, non-volant early-diverging avialan.
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- Stable ID
biology-yuezhuornis-jurassic-flightless-avialan-2026- Revision
biology-yuezhuornis-jurassic-flightless-avialan-2026.v1- Field
- Biology and Earth science · Vertebrate palaeontology and early avialan evolution
- Evidence
- Tier 1 · Peer reviewed: Yes
- Record state
- Current · Peer-reviewed fossil and phylogenetic inference
- Last checked
AI role
No substantive AI role was disclosed in the inspected primary paper or specialist commentary.
Record details
- Problem or result
- Ecological diversity and loss or absence of flight in early avialans
- Authors
- Liming Xu, Min Wang, Ganmin Lin, Liping Dong, Ke Deng, Xing Xu, Zhonghe Zhou and collaborators
- Institutions
- Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences; Fujian Institute of Geological Sciences; collaborators
- Result date
- Published October 14, 2026
Why it matters
A non-volant avialan contemporary with Archaeopteryx expands the known ecological range near the origin of birds and argues against a simple progression toward steadily improved flight.
Limits
The taxon is known from one incomplete specimen. Flight ability and phylogenetic position are anatomical and model-based inferences that further fossils may revise; the result does not imply multiple origins of modern birds.
Sources
- Primary: Nature description of Yuezhuornis
- Independent specialist context: Nature News & Views on Jurassic flightless avialans
Correction and revision history
- 2026-10-19 — Added after primary-source, scope, status, AI-role and limitation review.
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