Evidence map›Paper›PMID 36539437›Full record

ArticleNature communications2022

Exceptional preservation and foot structure reveal ecological transitions and lifestyles of early theropod flyers.

Michael Pittman, Phil R Bell, Case Vincent Miller, Nathan J Enriquez, Xiaoli Wang, Xiaoting Zheng, Leah R Tsang, Yuen Ting Tse, Michael Landes, Thomas G Kaye

Abstract read
In one paragraph

Article in Nature communications, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

14 citing papers in PubMed.

  1. Diet of bird-like troodontid dinosaurs: synthesis of a contentious clade.Biological reviews of the Cambridge Philosophical Society · 2026
    Review
  2. Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
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  8. Insights into the early evolution of modern avian physiology from fossilized soft tissues from the Mesozoic.Philosophical transactions of the Royal Society of London. Series B, Biological sciences · 2025
    Review
  9. Hidden artistic complexity of Peru's Chancay culture discovered in tattoos by laser-stimulated fluorescence.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  10. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Michael PittmanSchool of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China. mpittman@cuhk.edu.hk.ORCID 0000-0002-6149-3078
Phil R BellSchool of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia.ORCID 0000-0001-5890-8183
Case Vincent MillerDepartment of Earth Sciences, The University of Hong Kong, Pokfulam, Hong Kong SAR, China.ORCID 0000-0002-6467-0199
Nathan J EnriquezSchool of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia.
Xiaoli WangInstitute of Geology and Paleontology, Linyi University, Linyi City, Shandong, 276005, China. wangxiaoli@lyu.edu.cn.
Xiaoting ZhengInstitute of Geology and Paleontology, Linyi University, Linyi City, Shandong, 276005, China.
Leah R TsangSchool of Environmental and Rural Science, University of New England, Armidale, NSW, 2351, Australia.
Yuen Ting TseSchool of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.
Michael LandesDepartment of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON, L5L 1C6, Canada.
Thomas G KayeFoundation for Scientific Advancement, Sierra Vista, AZ, 85650, USA.ORCID 0000-0001-7996-618X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Morphology of keratinised toe pads and foot scales, hinging of foot joints and claw shape and size all inform the grasping ability, cursoriality and feeding mode of living birds. Presented here is morphological evidence from the fossil feet of early theropod flyers. Foot soft tissues and joint articulations are qualitatively assessed using laser-stimulated fluorescence. Pedal claw shape and size are quantitatively analysed using traditional morphometrics. We interpret these foot data among existing evidence to better understand the evolutionary ecology of early theropod flyers. Jurassic flyers like Anchiornis and Archaeopteryx show adaptations suggestive of relatively ground-dwelling lifestyles. Early Cretaceous flyers then diversify into more aerial lifestyles, including generalists like Confuciusornis and specialists like the climbing Fortunguavis. Some early birds, like the Late Jurassic Berlin Archaeopteryx and Early Cretaceous Sapeornis, show complex ecologies seemingly unique among sampled modern birds. As a non-bird flyer, finding affinities of Microraptor to a more specialised raptorial lifestyle is unexpected. Its hawk-like characteristics are rare among known theropod flyers of the time suggesting that some non-bird flyers perform specialised roles filled by birds today. We demonstrate diverse ecological profiles among early theropod flyers, changing as flight developed, and some non-bird flyers have more complex ecological roles.

Indexed as

DinosaursMusculoskeletal SystemAdaptation, PhysiologicalAnimalsBiological EvolutionFossilsPhylogeny

Identifiers

PMID36539437
PMCPMC9768147

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.