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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.
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.
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.
An Early Cretaceous eutherian and the placental–marsupial dichotomy
TLDR
A new Jehol eutherian, Ambolestes zhoui, with a nearly complete skeleton that preserves anatomical details that are unknown from contemporaneous mammals, including the ectotympanic and hyoid apparatus is reported, demonstrating that Sinodelphys is a eutherians and that postcranial differences between Sinodelsphys and the Jehol Eutherian Eomaia are variations among the early members of the placental lineage.
Unique caudal plumage of Jeholornis and complex tail evolution in early birds
TLDR
Jeholornis reveals that tail evolution was complex and not a simple progression from frond to fan, and probably evolved as the result of complex interactions between natural and sexual selective pressures and served both aerodynamic and ornamental functions.
Insight into the early evolution of the avian sternum from juvenile enantiornithines.
TLDR
Although superficially similar, the sternum formed very differently in enantiornithines and ornithuromorphs, suggesting that several ornithothoracine sternal features may represent parallelism, highlights the importance of ontogenetic studies for understanding homology and the evolution of skeletal features in palaeontology.
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