Late Cretaceous neornithine from Europe illuminates the origins of crown birds

Field, Daniel J. and Benito, Juan and Chen, Albert and Jagt, John W. M. and Ksepka, Daniel T. (2020) Late Cretaceous neornithine from Europe illuminates the origins of crown birds. Nature, 579 (7799). pp. 397-401. ISSN 0028-0836 DOI https://doi.org/10.1038/s41586-020-2096-0

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Official URL: https://doi.org/10.1038/s41586-020-2096-0

Abstract

Our understanding of the earliest stages of crown bird evolution is hindered by an exceedingly sparse avian fossil record from the Mesozoic era. The most ancient phylogenetic divergences among crown birds are known to have occurred in the Cretaceous period1,2,3, but stem-lineage representatives of the deepest subclades of crown birds—Palaeognathae (ostriches and kin), Galloanserae (landfowl and waterfowl) and Neoaves (all other extant birds)—are unknown from the Mesozoic era. As a result, key questions related to the ecology4,5, biogeography3,6,7 and divergence times1,8,9,10 of ancestral crown birds remain unanswered. Here we report a new Mesozoic fossil that occupies a position close to the last common ancestor of Galloanserae and fills a key phylogenetic gap in the early evolutionary history of crown birds10,11. Asteriornis maastrichtensis, gen. et sp. nov., from the Maastrichtian age of Belgium (66.8–66.7 million years ago), is represented by a nearly complete, three-dimensionally preserved skull and associated postcranial elements. The fossil represents one of the only well-supported crown birds from the Mesozoic era12, and is the first Mesozoic crown bird with well-represented cranial remains. Asteriornis maastrichtensis exhibits a previously undocumented combination of galliform (landfowl)-like and anseriform (waterfowl)-like features, and its presence alongside a previously reported Ichthyornis-like taxon from the same locality13 provides direct evidence of the co-occurrence of crown birds and avialan stem birds. Its occurrence in the Northern Hemisphere challenges biogeographical hypotheses of a Gondwanan origin of crown birds3, and its relatively small size and possible littoral ecology may corroborate proposed ecological filters4,5,9 that influenced the persistence of crown birds through the end-Cretaceous mass extinction.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA76
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
08 - Green Open Access
12 - PhD
Journal or Publication Title: Nature
Volume: 579
Page Range: pp. 397-401
Identification Number: https://doi.org/10.1038/s41586-020-2096-0
Depositing User: Sarah Humbert
Date Deposited: 20 Mar 2020 17:08
Last Modified: 20 Mar 2020 17:08
URI: http://eprints.esc.cam.ac.uk/id/eprint/4661

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