[PaleoOrnithology • 2025] Baminornis zhenghensis • Short -short bird of the latest Jurassic of China

Baminornis zhenghensis Chen, METRO. Wang, Dong, GRAM. Zhou, X. Xu, Deng, L. Xu, Zhang, L. Wang, Du, G. Lin, M. Lin and Z. Zhou, 2025 Reconstruction of life by Zhao Chuang

Abstract

Recent macroevolutive studies predict a diversification of the first birds during the Jurassic period, but the fossil record of unquestionable jurássic birds is limited to Archeptérixwhich has also been referred to the dinosaurs ofinychosaura by some analysis. Although they have feathered wings, known Jurassic birds are more similar to non -avial thermals by having the ancestral tail of long and long reptile. This is in a marked contrast with most Cretaceous and Crownward taxa, which have a short tail that ends in a compound bone called Pigostyle. Here we inform about the oldest short -tailed avialan, Baminornis zhenghensis Gen in sp. nov.From the recently discovered fauna of the Jurassic Jurassic Zhenghe, which fills a notable space-time empty in the first fossil record of Avialan branched. B. Zhenghensis exhibits a unique combination of pectoral and pelvic girdles derived from ornitotoral and hand Maniraptoran non -avialana by Pesiomorphic, which demonstrates the mosaic evolution along the line Avialan of the stem. A furculan collect from the same town is referred to ornituromorphs on the basis of our morphometric and phylogenetic analyzes. These newly discovered fossils demonstrate the early appearance of highly derived bird features, and together with an ancinitin fossil from the same town, suggest an earlier origin of the birds and a radiation of the first birds in the Jurassic.