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A NEW EARLY LATE TRIASSIC SAURISCHIAN DINOSAUR FROM RIO GRANDE DO SUL STATE, BRAZIL

  • Bonaparte Jose F.
    Museu de Ciencias Naturais da Fundacao Zoobotanica do Rio Grande do Sul; and CNPq
  • Ferigolo Jorge
    Museu de Ciencias Naturais da Fundacao Zoobotanica do Rio Grande do Sul
  • Ribeiro Ana Maria
    Museu de Ciencias Naturais da Fundacao Zoobotanica do Rio Grande do Sul

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Abstract

Two incomplete specimens of a new genus and species of Saurischia, Guaibasaurus candelariensis, from the Caturrita Formation of Rio Grande do Sul, southern Brazil, offers new data on the basal dinosaurs and a new interpretation of the early evolution of the Saurischia. The new taxon is more primitive than the Herrerasauridae, in the structure of the dorsal vertebrae, ilium, pubis, femur, tarsus and foot. The mesotarsal condition and the outline of the distal section of tibia indicate the saurischian nature of this new form, but the almost unreduced medial wall of the acetabular portion of ilium shows an unrecorded primitive condition within the cited group. These particular characters lead us to propose a new family : the Guaibasauridae. Several features suggesting affinities with both the Prosauropoda and Theropoda, imply that Guaibasaurus candelariensis may belong to the ancestral group for both of them.

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Details

  • CRID
    1573387451763638400
  • NII Article ID
    110004312491
  • NII Book ID
    AA1102331X
  • ISSN
    13429574
  • Text Lang
    en
  • Data Source
    • CiNii Articles

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