The evolution of the modern avian digestive system: insights from paravian fossils from the Yanliao and Jehol biotas DOI
Jingmai K. O’Connor,

Zhonghe Zhou

Palaeontology, Journal Year: 2019, Volume and Issue: 63(1), P. 13 - 27

Published: Nov. 6, 2019

Abstract The avian digestive system, like other aspects of biology, is highly modified relative to reptiles. Together these modifications have imparted the great success Neornithes, most diverse clade amniotes alive today. It important understand when and how modern system evolved among neornithine ancestors in order elucidate evolutionary this biology stem birds their closest dinosaurian relatives: Mesozoic Paraves. Although direct preservation soft tissue has not yet been reported, ingested remains anatomical location preserved articulated fossils hint at structure its abilities. Almost all data concerning evidence diet Paraves comes from either Upper Jurassic Yanliao Biota or Lower Cretaceous Jehol Biota, both which are known deposits north‐eastern China. Here, sum gleaned thousands exceptionally well‐preserved paravians interpreted with regards evolution feeding apparatus. This information suggests intrinsic differences between closely related lineages implying strong homoplasy that each lineage non‐ornithuromorph was specialized. Regardless, capabilities appear be limited Ornithuromorpha, although complete set derived characters restricted Neornithes.

Language: Английский

The Origin and Diversification of Birds DOI Creative Commons
Stephen L. Brusatte, Jingmai K. O’Connor, Erich D. Jarvis

et al.

Current Biology, Journal Year: 2015, Volume and Issue: 25(19), P. R888 - R898

Published: Oct. 1, 2015

Language: Английский

Citations

254
Durable, self-healing superhydrophobic nanofibrous membrane with self-cleaning ability for highly-efficient oily wastewater purification DOI
Wenjing Ma, Yichun Ding, Yuansheng Li

et al.

Journal of Membrane Science, Journal Year: 2021, Volume and Issue: 634, P. 119402 - 119402

Published: May 6, 2021

Language: Английский

Citations

191
Synchrotron scanning reveals amphibious ecomorphology in a new clade of bird-like dinosaurs DOI
Andrea Cau, Vincent Beyrand, Dennis F. A. E. Voeten

et al.

Nature, Journal Year: 2017, Volume and Issue: 552(7685), P. 395 - 399

Published: Dec. 1, 2017

Language: Английский

Citations

148
A new Jurassic scansoriopterygid and the loss of membranous wings in theropod dinosaurs DOI
Min Wang, Jingmai K. O’Connor, Xing Xu

et al.

Nature, Journal Year: 2019, Volume and Issue: 569(7755), P. 256 - 259

Published: May 1, 2019

Language: Английский

Citations

133
Potential for Powered Flight Neared by Most Close Avialan Relatives, but Few Crossed Its Thresholds DOI Creative Commons
Rui Pei, Michael Pittman, Pablo A. Goloboff

et al.

Current Biology, Journal Year: 2020, Volume and Issue: 30(20), P. 4033 - 4046.e8

Published: Aug. 6, 2020

Uncertainties in the phylogeny of birds (Avialae) and their closest relatives have impeded deeper understanding early theropod flight. To help address this, we produced an updated evolutionary hypothesis through automated analysis Theropod Working Group (TWiG) coelurosaurian phylogenetic data matrix. Our larger, more resolved, better-evaluated TWiG-based supports grouping dromaeosaurids + troodontids (Deinonychosauria) as sister taxon to (Paraves) recovery Anchiornithinae earliest diverging birds. Although will continue developing, our current results provide a pertinent opportunity evaluate what know about With available for vaned feathered pennaraptorans, estimate potential powered flight among relatives. We did this by using ancestral state reconstruction calculating maximum minimum estimates two proxies potential-wing loading specific lift. These confirm but its rarity ancestors avialan (select unenlagiine microraptorine dromaeosaurids). For first time, find broad range these neared wing lift thresholds indicative potential. This suggests there was greater experimentation with wing-assisted locomotion before evolved than previously appreciated. study adds invaluable support multiple origins theropods (≥3 times), which now from already nearing associated thresholds, provides framework further study. VIDEO ABSTRACT.

Language: Английский

Citations

94
Pterosaur integumentary structures with complex feather-like branching DOI
Zixiao Yang, Baoyu Jiang, Maria E. McNamara

et al.

Nature Ecology & Evolution, Journal Year: 2018, Volume and Issue: 3(1), P. 24 - 30

Published: Nov. 22, 2018

Language: Английский

Citations

88
A bony-crested Jurassic dinosaur with evidence of iridescent plumage highlights complexity in early paravian evolution DOI Creative Commons
Dongyu Hu, Julia A. Clarke, Chad M. Eliason

et al.

Nature Communications, Journal Year: 2018, Volume and Issue: 9(1)

Published: Jan. 9, 2018

The Jurassic Yanliao theropods have offered rare glimpses of the early paravian evolution and particularly bird origins, but, with exception bizarre scansoriopterygids, they shown similar skeletal integumentary morphologies. Here we report a distinctive new theropod species bearing prominent lacrimal crests, bony ornaments previously known from more basal theropods. It shows longer arm leg feathers than Anchiornis tail asymmetrical vanes forming surface area even larger that in Archaeopteryx. Nanostructures, interpreted as melanosomes, are morphologically to organized, platelet-shaped organelles produce bright iridescent colours extant birds. indicates presence ornaments, feather colour flight-related features consistent proposed rapid character significant diversity signalling locomotor strategies near origins.

Language: Английский

Citations

87
The oldestArchaeopteryx(Theropoda: Avialiae): a new specimen from the Kimmeridgian/Tithonian boundary of Schamhaupten, Bavaria DOI Creative Commons
Oliver W. M. Rauhut, Christian Foth,

Helmut Tischlinger

et al.

PeerJ, Journal Year: 2018, Volume and Issue: 6, P. e4191 - e4191

Published: Jan. 26, 2018

The iconic primeval bird Archaeopteryx was so far mainly known from the Altmühltal Formation (early Tithonian) of Bavaria, southern Germany, with one specimen having been found in overlying Mörnsheim Formation. A new (the 12th skeletal specimen) earliest Tithonian Painten Schamhaupten (Bavaria) represents oldest representative genus. shows several interesting anatomical details, including presence a postorbital contact jugal, separate prefrontal and coronoid, opisthocoelous mid-cervical vertebrae. Based on observations specimen, we discuss problematic issues concerning Archaeopteryx, monophyly diagnosis genus, absence/presence sternum, position gastralia, variation morphometrics dental morphology that for genus Berlin, Eichstätt, Solnhofen, Munich, Daiting, Thermopolis, 11th, specimens can be referred to this high certainty. Maxberg is very probably also an based overall similarity, although none diagnostic characters evaluated ninth ('chicken wing') might but cannot any In comparison other paravians, distally thickened anterior pectoral ribs indicates rather large cartilagenous sternum present taxon. contrast non-opisthopubic theropods, opisthopubic taxa, such as many have posterior end gastral basket preserved at about half-length pubis, which reflect post-mortem collapse enlarged abdominal air sacs these taxa. Specimens show amount variation, both limb bones well dentition. respect latter aspect, tooth number, spacing, orientation, morphology, no two showing exact same pattern. significance unclear, possible explanations reach intraspecific (and possibly ontogenetic and/or sexual dimorphic) possibility represent 'species flock' due island speciation after initial dispersal into Solnhofen Archipelago.

Language: Английский

Citations

87
Pennaraptoran Theropod Dinosaurs Past Progress and New Frontiers DOI
Michael Pittman, Xing Xu

Bulletin of the American Museum of Natural History, Journal Year: 2020, Volume and Issue: 440(1), P. 1 - 1

Published: Aug. 21, 2020

Language: Английский

Citations

71
Functional constraints on the number and shape of flight feathers DOI
Yosef Kiat, Jingmai K. O’Connor

Proceedings of the National Academy of Sciences, Journal Year: 2024, Volume and Issue: 121(8)

Published: Feb. 12, 2024

As a fundamental ecological aspect of most organisms, locomotor function significantly constrains morphology. At the same time, evolution novel abilities has produced dramatic morphological transformations, initiating some significant diversifications in life history. Despite new fossil evidence, it remains unclear whether volant locomotion had single or multiple origins pennaraptoran dinosaurs and individual taxa are controversial. The powered flight modern birds involved exaptation feathered surfaces extending off limbs tail yet studies concerning potential pennaraptorans do not account for structure morphology wing feathers themselves. Analysis number shape remex rectrix across large dataset extant indicates that remiges rectrices degree primary vane asymmetry strongly correlate with ability revealing important functional constraints. Among these traits, phenotypic flexibility varies reflected by different rates at which changes evolve, such traits reflect ancestral condition, whereas others current function. While Mesozoic Microraptor have morphologies consistent birds, anchiornithines deviate providing strong evidence this clade was volant. results analyses support origin dinosaurian indicate early stages sampled currently available record.

Language: Английский

Citations

10