Reference health
A bizarre Early Cretaceous enantiornithine bird with unique crural feathers and an ornithuromorph plough-shaped pygostyle
53/53 checkable references clean · checked 2026-07-14
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a publisher retraction, withdrawal, or removal notice.
16 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 53 checked references that resolve
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The Jehol Biota: Definition and distribution of exceptionally preserved relicts of a continental Early Cretaceous ecosystem
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A primitive confuciusornithid bird from China and its implications for early avian flight
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The<sup>40</sup>Ar/<sup>39</sup>Ar dating of the early Jehol Biota from Fengning, Hebei Province, northern China
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A revision of enantiornithine (Aves: Ornithothoraces) skull morphology
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Insight into diversity, body size and morphological evolution from the largest Early Cretaceous enantiornithine bird
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Cranial morphology of<i>Archaeopteryx</i>: evidence from the seventh skeleton
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A reappraisal of<i>Boluochia zhengi</i>(Aves: Enantiornithes) and a discussion of intraclade diversity in the Jehol avifauna, China
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A New Species of Pengornithidae (Aves: Enantiornithes) from the Lower Cretaceous of China Suggests a Specialized Scansorial Habitat Previously Unknown in Early Birds
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An Enantiornithine with a Fan-Shaped Tail, and the Evolution of the Rectricial Complex in Early Birds
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Insight into the evolution of avian flight from a new clade of Early Cretaceous ornithurines from China and the morphology of <i>Yixianornis grabaui</i>
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A new enantiornithine from the Yixian Formation with the first recognized avian enamel specialization
resolves10.1080/02724634.2015.1054496
A new Jehol enantiornithine bird with three-dimensional preservation and ovarian follicles
resolves10.1080/14772019.2015.1073801
A new small enantiornithine bird from the Jehol Biota, with implications for early evolution of avian skull morphology
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Anatomy of the basal ornithuromorph bird<i>Archaeorhynchus spathula</i>from the Early Cretaceous of Liaoning, China
resolves10.1038/srep19700
A new basal bird from China with implications for morphological diversity in early birds
resolves10.1002/gj.1057
Feathers and ‘feather‐like’ integumentary structures in Liaoning birds and dinosaurs
resolves10.3390/geosciences2030157
Homology and Potential Cellular and Molecular Mechanisms for the Development of Unique Feather Morphologies in Early Birds
resolves10.1038/nature08965
Exceptional dinosaur fossils show ontogenetic development of early feathers
resolves10.1038/nature13467
New specimen of Archaeopteryx provides insights into the evolution of pennaceous feathers
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Comparative evidence for costs of secondary sexual characters: adaptive vane emargination of ornamented feathers in birds
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Osteohistology of<i>Confuciusornis sanctus</i>(Theropoda: Aves)
resolves10.1098/rspb.2016.0214
Rates of morphological evolution are heterogeneous in Early Cretaceous birds
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Natural and experimental reduction of the avian fibula: Developmental thresholds and evolutionary constraint
resolves10.1111/evo.12882
Molecular development of fibular reduction in birds and its evolution from dinosaurs
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Bipedalism, flight, and the evolution of theropod locomotor diversity
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FROM FROND TO FAN:
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AND THE EVOLUTION OF SHORT‐TAILED BIRDS
resolves10.1080/02724634.2009.10010371
Phylogenetic support for a specialized clade of Cretaceous enantiornithine birds with information from a new species
resolves10.1007/s11430-010-4094-9
Vertebrate diversity of the Jehol Biota as compared with other lagerstätten
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Incorporating phylogenetic uncertainty on phylogeny‐based palaeontological dating and the timing of turtle diversification
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Uncertainty in the Age of Fossils and the Stratigraphic Fit to Phylogenies
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Unique caudal plumage of
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and complex tail evolution in early birds
The 16 references without a DOI — listed, not checked
no DOI — not checkedChiappe, L. M. & Walker, C. A. in Mesozoic Birds: above the Heads of Dinosaurs (eds Chiappe, L. M. & Witmer, L. M.) 240–267 (University of California, 2002).
no DOI — not checkedWang, M., Zhou, Z., O’Connor, J. K. & Zelenkov, N. V. A new diverse enantiornithine family (Bohaiornithidae fam. nov.) from the Lower Cretaceous of China with information from two new species. Vertebr. Palasiat. 52, 31–76 (2014).
no DOI — not checkedO’Connor, J. K. A systematic review of Enantiornithes (Aves: Ornithothoraces) University of Southern California (2009).
no DOI — not checkedBaumel, J. J. & Witmer, L. M. in Handbook of Avian anatomy: Nomina Anatomica Avium (eds Baumel, J. J. et al.) 45–132 (Nuttall Ornithological Club, 1993).
no DOI — not checkedChiappe, L. M., Ji, S., Ji, Q. & Norell, M. A. Anatomy and systematics of the Confuciusornithidae (Theropoda: Aves) from the Late Mesozoic of northeastern China. Bull. Am. Mus. Nat. Hist. 242, 1–89 (1999).
no DOI — not checkedRoberts, L. N. & Gareth, J. D. Narrow primary feather rachises in Confuciusornis and Archaeopteryx suggest poor flight ability. Nature 328, 887–889 (2010).
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no DOI — not checkedChinsamy, A. The Microstructure of Dinosaur Bone: Deciphering Biology with Fine-Scale Techniques Johns Hopkins University Press (2005).
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no DOI — not checkedO’Connor, J. K., Wang, M., Zhou, S. & Zhou, Z. Osteohistology of the Lower Cretaceous Yixian Formation ornithuromorph (Aves) Iteravis huchzermeyeri. Palaeontol. Electron 18, 1–11 (2015).
no DOI — not checkedChiappe, L. M. & Meng, Q. Birds of Stone: Chinese Avian Fossils from the Age of Dinosaurs Johns Hopkins University Press (2016).
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