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A bizarre Jurassic maniraptoran theropod with preserved evidence of membranous wings
TLDR
Documentation of the unique forelimbs of Yi greatly increases the morphological disparity known to exist among dinosaurs, and highlights the extraordinary breadth and richness of the evolutionary experimentation that took place close to the origin of birds. Expand
The Origin and Diversification of Birds
TLDR
Birds evolved from theropod dinosaurs during the Jurassic and Cretaceous, becoming capable fliers with supercharged growth rates, but were decimated at the end-Cretaceous extinction alongside their close dinosaurian relatives. Expand
A revision of enantiornithine (Aves: Ornithothoraces) skull morphology
TLDR
A comprehensive overview of the current knowledge of enantiornithine skull anatomy is presented and a number of trophic specializations can be deduced from the range of preserved morphologies, further hinting at the morphological and ecological diversity of the Cretaceous Enantiornithes. Expand
Anatomy of the Basal Ornithuromorph Bird Archaeorhynchus spathula from the Early Cretaceous of Liaoning, China
TLDR
These new specimens are subadult: together with the holotype of Archaeorhynchus, they constitute the entire Early Cretaceous record of subadult ornithuromorphs and reveal important information regarding the ontogeny of this group. Expand
A new species of Jeholornis with complete caudal integument
TLDR
This new specimen reveals the tail integument of Jeholornithiformes, the morphology of which appears to have no aerodynamic benefit suggesting this clade evolved plumage patterns that were primarily for display. Expand
Preservation of ovarian follicles reveals early evolution of avian reproductive behaviour
TLDR
The first discovery of fossilized mature or nearly mature ovarian follicles are reported, revealing a previously undocumented stage in dinosaur reproduction: reproductively active females near ovulation. Expand
Anatomy of the Early Cretaceous Enantiornithine Bird Rapaxavis pani
TLDR
The holotype and only known specimen of Rapaxavis pani is redescribed here after more extensive preparation and reveals important information for better understanding the anatomy and phylogenetic relationships of longipterygids, in particular, as well as basal birds as a whole. Expand
On the absence of sternal elements in Anchiornis (Paraves) and Sapeornis (Aves) and the complex early evolution of the avian sternum
TLDR
It is proposed that the sternum may have been completely lost in Anchiornis and Sapeornis (and Archaeopteryx) based on histological analysis and the excellent preservation of soft-tissue structures, thus suggesting the absence of a sternum could represent the plesiomorphic avian condition. Expand
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