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The earliest bird-line archosaurs and the assembly of the dinosaur body plan
Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA..
Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England..
Univ Birmingham, Sch Geog Earth & Environm Sci, Birmingham B15 2TT, W Midlands, England.;Museo Argentino Ciencias Nat Bernardino Rivadavia, CONICET, Secc Paleontol Vertebrados, Buenos Aires, DF, Argentina..
Nat Hist Museum, Dept Earth Sci, Cromwell Rd, London SW7 5BD, England..
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2017 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 544, no 7651, 484-+ p.Article in journal (Refereed) Published
Abstract [en]

The relationship between dinosaurs and other reptiles is well established(1-4), but the sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils with transitional morphologies. The closest extinct relatives of dinosaurs either have highly derived morphologies(5-7) or are known from poorly preserved(8,9) or incomplete material(10,11). Here we describe one of the stratigraphically lowest and phylogenetically earliest members of the avian stem lineage (Avemetatarsalia), Teleocrater rhadinus gen. et sp. nov., from the Middle Triassic epoch. The anatomy of T. rhadinus provides key information that unites several enigmatic taxa from across Pangaea into a previously unrecognized clade, Aphanosauria. This clade is the sister taxon of Ornithodira (pterosaurs and birds) and shortens the ghost lineage inferred at the base of Avemetatarsalia. We demonstrate that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the crocodylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians. Early avemetatarsalians were substantially more species-rich, widely geographically distributed and morphologically diverse than previously recognized. Moreover, several early dinosauromorphs that were previously used as models to understand dinosaur origins may represent specialized forms rather than the ancestral avemetatarsalian morphology.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2017. Vol. 544, no 7651, 484-+ p.
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Evolutionary Biology
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URN: urn:nbn:se:uu:diva-322171DOI: 10.1038/nature22037ISI: 000400051900044PubMedID: 28405026OAI: oai:DiVA.org:uu-322171DiVA: diva2:1096159
Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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Niedzwiedzki, Grzegorz

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