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A new silesaurid from Carnian beds of Brazil fills a gap in the radiation of avian line archosaurs.

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  • المؤلفون: Müller RT;Müller RT;Müller RT; Garcia MS; Garcia MS; Garcia MS
  • المصدر:
    Scientific reports [Sci Rep] 2023 Apr 11; Vol. 13 (1), pp. 4981. Date of Electronic Publication: 2023 Apr 11.
  • نوع النشر :
    Journal Article; Research Support, Non-U.S. Gov't
  • اللغة:
    English
  • معلومة اضافية
    • المصدر:
      Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE
    • بيانات النشر:
      Original Publication: London : Nature Publishing Group, copyright 2011-
    • الموضوع:
      Biological Evolution* ; Dinosaurs*; Animals ; Phylogeny ; Ecosystem ; Brazil ; Birds
    • نبذة مختصرة :
      Comprising the oldest unequivocal dinosauromorphs in the fossil record, silesaurs play an important role in the Triassic radiation of dinosaurs. These reptiles provide the main source of information regarding the ancestral body plan of dinosaurs, as well as the basis for biogeographic models. Nevertheless, the co-occurrence of silesaurs and the oldest unequivocal dinosaurs is rare, which hampers reliable ecological inferences. Here we present the first species of silesaur from the oldest unequivocal dinosaur-bearing beds from Brazil. Amanasaurus nesbitti gen. et sp. nov. possesses a unique set of femoral traits among silesaurs, including the oldest occurrence of an anterior trochanter separated by the femoral shaft by a marked cleft. Its femoral length indicates that the new species rivals in size with most coeval dinosaurs. This find challenges the assumption that in faunas where silesaurs and unambiguous dinosaurs co-occurred, silesaurs were relatively smaller. Moreover, the presence of dinosaur-sized silesaurs within ecosystems with lagerpetids, sauropodomorphs and herrerasaurids reinforces the complex scenario regarding the early radiation of Pan-Aves. Silesaurs-independent of their phylogenetic position-persisted during most of the Triassic Period, with its plesiomorphic body size advancing through the dawn of dinosaurs, instead of silesaur lineages decrease in body size through time.
      (© 2023. The Author(s).)
    • Comments:
      Erratum in: Sci Rep. 2024 Aug 22;14(1):19515. doi: 10.1038/s41598-024-70440-4. (PMID: 39174824)
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    • الموضوع:
      Date Created: 20230411 Date Completed: 20230413 Latest Revision: 20240824
    • الموضوع:
      20240826
    • الرقم المعرف:
      PMC10090097
    • الرقم المعرف:
      10.1038/s41598-023-32057-x
    • الرقم المعرف:
      37041170