Overview
- Researchers published the formal description of Jian changmaensis on June 4, 2026, naming the holotype GSGM‑D050 from the Lower Cretaceous Xiagou Formation.
- The holotype consists of an articulated left pectoral girdle and forelimb (scapulocoracoid, humerus about 10 cm, radius and ulna) that let authors estimate a roughly 1.2 m wingspan.
- Phylogenetic analysis in the Annals of Carnegie Museum places Jian within Microraptorinae, which pushes the unambiguous fossil record of that clade from the Jehol Group into northwestern China.
- Based on limb proportions and comparisons with other microraptorines, authors infer long feathers on fore‑ and hindlimbs and a squirrel‑like gliding ecology that could make Jian a plausible predator responsible for clustered, pellet‑like accumulations of crushed bird bones at Changma.
- All interpretations are explicitly cautious because the species is known only from shoulder and forelimb bones, and researchers say new fossils and further study will be needed to confirm its plumage, locomotion and direct link to the bird‑bone deposits.