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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.
Exceptional dinosaur fossils show ontogenetic development of early feathers
TLDR
An early-juvenile specimen and a late- juvenile specimen, both referable to the oviraptorosaur Similicaudipteryx, recovered from the Lower Cretaceous Yixian Formation of western Liaoning, China are described, suggesting that early feathers were developmentally more diverse than modern ones and that some developmental features have been lost in feather evolution.
An Early Cretaceous heterodontosaurid dinosaur with filamentous integumentary structures
TLDR
Tianyulong extends the geographical distribution of heterodontosaurids to Asia and confirms the clade’s previously questionable temporal range extension into the Early Cretaceous period, and represents the first confirmed report, to the authors' knowledge, of filamentous integumentary structures in an ornithischian dinosaur.
A new feather type in a nonavian theropod and the early evolution of feathers
TLDR
Congruence between the full range of paleontological and developmental data strongly supports the hypothesis that feathers evolved and initially diversified in nonavian theropods before the origin of birds and the evolution of flight.
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.
Hind Wings in Basal Birds and the Evolution of Leg Feathers
TLDR
Together these fossils show that early avialans possessed four wings, rather than two, and provide solid evidence for the existence of enlarged leg feathers on a variety of basal birds, and suggest that extensively scaled feet might have appeared secondarily at an early stage in ornithuromorph evolution.
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.
A new arboreal haramiyid shows the diversity of crown mammals in the Jurassic period.
TLDR
A new haramiyid from the Jurassic period of China is reported, which is, to the authors' knowledge, the largest reported so far and shows again that, regardless of various phylogenetic scenarios, a complex pattern of evolution involving many convergences and/or reversals existed in Mesozoic mammals.
Insights into the evolution of rachis dominated tail feathers from a new basal enantiornithine (Aves: Ornithothoraces)
TLDR
This paper aims to demonstrate the efforts towards in-situ applicability of EMMARM, as to provide real-time information about concrete mechanical properties such as E-modulus and compressive strength and high-resolution X-ray diffraction analysis.
Dental and Mandibular Morphologies of Arboroharamiya (Haramiyida, Mammalia): A Comparison with Other Haramiyidans and Megaconus and Implications for Mammalian Evolution
TLDR
Detailed morphological data demonstrate that haramiyidans are more similar to multituberculates than to any other mammaliaforms, and further support the view that Arboroharamiya, as a derived haramiYidan, shows similarity to multitubculates in tooth and mandible morphologies.
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