The evolution of the modern avian digestive system: insights from paravian fossils from the Yanliao and Jehol biotas

@article{OConnor2019TheEO,
  title={The evolution of the modern avian digestive system: insights from paravian fossils from the Yanliao and Jehol biotas},
  author={Jingmai K. O’Connor and Zhonghe Zhou},
  journal={Palaeontology},
  year={2019},
  volume={63}
}
The avian digestive system, like other aspects of avian biology, is highly modified relative to other reptiles. Together these modifications have imparted the great success of Neornithes, the most diverse clade of amniotes alive today. It is important to understand when and how aspects of the modern avian digestive system evolved among neornithine ancestors in order to elucidate the evolutionary success of this important clade and to understand the biology of stem birds and their closest… 
Late Cretaceous neornithine from Europe illuminates the origins of crown birds
TLDR
A newly discovered fossil from the Cretaceous of Belgium is the oldest modern bird ever found, showing a unique combination of features and suggesting attributes shared by avian survivors of the end-Cretaceous mass extinction.
Investigating Possible Gastroliths in a Referred Specimen of Bohaiornis guoi (Aves: Enantiornithes)
Gastroliths, where preserved, can provide indirect evidence regarding diet in extinct avian and non-avian dinosaurs. Masses of gastroliths consistent with the presence of a gastric mill are preserved
Exceptional avian pellet from the Paleocene of Patagonia and description of its content: a new species of calyptocephalellid (Neobatrachia) anuran
TLDR
A fossil gastric pellet from the Danian ‘Banco Negro Inferior’ of the Salamanca Formation at Punta Peligro Locality (Chubut, Argentina) and its 3D preserved fossil content is studied, representing a new species of the genus Calyptocephalella.
Diet of Mesozoic toothed birds (Longipterygidae) inferred from quantitative analysis of extant avian diet proxies
Background Birds are key indicator species in extant ecosystems, and thus we would expect extinct birds to provide insights into the nature of ancient ecosystems. However, many aspects of extinct
Integrated phylogenomic and fossil evidence of stick and leaf insects (Phasmatodea) reveal a Permian–Triassic co-origination with insectivores
TLDR
A Permian to Triassic origin of crown Phasmatodea coinciding with the radiation of early insectivorous parareptiles, amphibians and synapsids is recovered.
Mammal‐bearing gastric pellets potentially attributable to Troodon formosus at the Cretaceous Egg Mountain locality, Two Medicine Formation, Montana, USA
Fossil gastric pellets (regurgitalites) have distinct taphonomic characteristics that facilitate inferences of behavioural ecology in deep time, despite their rarity in the fossil record. Using the
Two emetolite-pterosaur associations from the Late Jurassic of China: showing the first evidence for antiperistalsis in pterosaurs
Knowledge about the pterosaur diet and digestive system is limited, and there is little direct evidence in the fossil record. Here, we report two specimens of the wukongopterid Kunpengopterus
New toothed Early Cretaceous ornithuromorph bird reveals intraclade diversity in pattern of tooth loss
The earliest record of the Ornithuromorpha, which includes crown birds, is currently known from the Early Cretaceous Jehol Biota in north-eastern China. Here we describe a new ornithuromorph bird,
Title: Trophic shift and the origin of birds
Birds are characterized by evolutionary specializations of both locomotion (e.g., flapping flight) and digestive system (toothless, crop, and gizzard), while the potential selection pressures
Cretophengodidae, a new Cretaceous beetle family, sheds light on the evolution of bioluminescence
TLDR
The fossil male possesses a light organ on the abdomen which presumably served a defensive function, documenting a Cretaceous radiation of bioluminescent beetles coinciding with the diversification of major insectivore groups such as frogs and stem-group birds.
...
...

References

SHOWING 1-10 OF 121 REFERENCES
Early evolution of the biological bird: perspectives from new fossil discoveries in China
TLDR
While no skeletal or integumentary features are recognized to define Aves, a partial reconstruction of the biology of Aves very close to its origin is identified: the presence of a crop and the loss of the right ovary.
Exceptional dinosaur fossils reveal early origin of avian-style digestion
TLDR
Six gastric pellets attributable to the recently discovered Anchiornis suggest that a digestive system resembling that of modern birds was already present in basal members of the Paraves, a clade including troodontids, dromaeosaurids, and birds, and that the evolution of modern avian digestion may have been related to the appearance of aerial locomotion in this lineage.
A new basal bird from China with implications for morphological diversity in early birds
TLDR
Phylogenetic analyses indicate that Chongmingia zhengi is basal to the dominant Mesozoic avian clades Enantiornithes and Ornithuromorpha, and represents a new basal avialan lineage.
A Morphological Study of the First Known Piscivorous Enantiornithine Bird from the Early Cretaceous of China
TLDR
It is shown that this fish-eating enantiornithine bird from the Lower Cretaceous Jiufotang Formation of Liaoning Province, northeastern China represents a new taxon, Piscivorenantiornis inusitatus, gen. et sp.
The trophic habits of early birds
  • J. O’Connor
  • Environmental Science, Geography
    Palaeogeography, Palaeoclimatology, Palaeoecology
  • 2019
A new ornithurine from the Early Cretaceous of China sheds light on the evolution of early ecological and cranial diversity in birds
TLDR
It is found that, consistent with a proposed developmental shift in cranial ontogeny late in avialan evolution, this elongate rostrum in Changzuiornis ahgmi is achieved through elongation of the maxilla while the premaxilla remains only a small part of rostral length.
Fossil evidence of avian crops from the Early Cretaceous of China
TLDR
Two Early Cretaceous birds, the basal ornithurine Hongshanornis and a basal avian Sapeornis, demonstrate that an essentially modern avian digestive system formed early in avian evolution.
A long-tailed, seed-eating bird from the Early Cretaceous of China
The lacustrine deposits of the Yixian and Jiufotang Formations in the Early Cretaceous Jehol Group in the western Liaoning area of northeast China are well known for preserving feathered dinosaurs,
...
...