Changzhousaurus sinensis. Picture credit score: Connor Ashbridge / CC BY 4.0.
The newly-identified dinosaur species lived in what’s now China about 120 million years in the past (Early Cretaceous epoch).
Scientifically named Changzhousaurus sinensis, the animal measured roughly 34 cm (13 inches) in whole physique size, putting it among the many smallest recognized non-avian theropods.
Regardless of its small dimension, the species mixed anatomical options seen throughout a number of branches of the bird-like dinosaur household tree.
Changzhousaurus sinensis was doubtless an early-diverging member of the deinonychosaur lineage, a bunch of pennaraptoran dinosaurs that features dromaeosaurs and troodontids.
“Pennaraptora contains a number of lately found small clades (e.g., Unenlagiinae, Microraptorinae, Scansoriopterygidae, Anchiornithinae, and Halszkaraptorinae) in addition to 4 long-recognized main teams (i.e., Oviraptorosauria, Dromaeosauridae, Troodontidae, and Avialae),” Dr. Xu wrote in his paper.
“Over the previous three a long time, spectacular fossils from each the newly acknowledged minor clades and the long-established main pennaraptoran teams have considerably crammed morphological gaps amongst main pennaraptoran lineages, yielded the earliest recognized fossil report of feathers, documented the earliest cases of theropod flight, uncovered surprising morphologies and ecological variations, and evidenced a fast radiation of Pennaraptora throughout the Center Jurassic.”
“Notably, these fossils have considerably superior our understanding of avian origins, revealing that pennaceous feathers, aerodynamic behaviors, and different hallmarks as soon as thought-about unique to Avialae happen in different pennaraptoran teams.”
“Nevertheless, quite a few vital points stay unresolved, together with these associated to reconstructing pennaraptoran phylogeny, habits, and ecology — in addition to the interpretation of particular person morphological characters.”
The holotype specimen of Changzhousaurus sinensis, slab and counter slab. Picture credit score: Xing Xu, doi: 10.19615/j.cnki.2096-9899.260616.
The fossilized stays of Changzhousaurus sinensis have been recovered from the fossil-rich Jiufotang Formation of western Liaoning province.
Preserved on a slab and a counter slab, the specimen represents an almost full skeleton together with in depth plumage overlaying its physique.
Changzhousaurus sinensis possessed roughly 16 extremely elongated tail feathers — about 4 instances femoral size, excess of comparable dinosaurs — that superficially resembled the decorative tail plumes of a peacock.
The dinosaur additionally carried unusually massive wings. Its main flight feathers measured about 12 cm (4.7 inches) lengthy, proportionally exceeding these of different recognized non-avian pennaraptorans.
The discovering means that feathered wing space and arm size didn’t at all times evolve collectively, difficult easy assumptions concerning the origins of flight-related buildings.
Giant feathers have been additionally current on its toes, reinforcing proof that some bird-like dinosaurs possessed four-winged physique plans.
“This discovery underscores the complexity of early pennaraptoran evolution and raises a number of conceptual and methodological points in pennaraptoran analysis,” Dr. Xu wrote within the paper.
“These points embrace methods to recuperate a sturdy pennaraptoran phylogeny, methods to infer the aerial habits and habitat ecology of early-diverging pennaraptorans, and methods to outline feathers and birds.”
The paper was printed on-line within the journal Vertebrata PalAsiatica.
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Xing Xu. 2026. A brand new feathered dinosaur from Early Cretaceous of northern China highlighting the complexity of early pennaraptoran evolution and feedback on a number of related conceptual and methodological points. Vertebrata Palasiatica, in press; doi: 10.19615/j.cnki.2096-9899.260616
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