page_title: Guaibasaurus
section_title: Classification
hierarchical_section_title: Guaibasaurus / Classification
caption_attribution_description: Restoration of Guaibasaurus candeleriensis.
context_page_description: Guaibasaurus is an extinct genus of basal dinosaur known from the Late Triassic Caturrita Formation of Rio Grande do Sul, southern Brazil. It was possibly a basal theropod or sauropodomorph.
context_section_description: José Bonaparte and colleagues, in their 1999 description of the genus, found it to be possible basal theropod and placed it in its own family, Guaibasauridae. Bonaparte and colleagues (2007) found another early Brazilian dinosaur Saturnalia to be very similar to it, and placed the two in the Guaibasauridae which was found to be a primitive saurischian group. Bonaparte found that these forms may have been "prosauropods" (primitive sauropodomorphs), or an assemblage of forms close to the common ancestor of the sauropodomorphs and theropods. Overall, Bonaparte considered that both Saturnalia and Guaibasaurus were more theropod-like than "prosauropod"-like.
  More recent cladistic analyses have disagreed on the placement of Guaibasaurus. Some analyses have found it to be a basal theropod, while others consider it a basal sauropodomorph. Other members of "Guaibasauridae" (such as Saturnalia) are generally considered to be very basal sauropodomorphs, and may or may not form a clade with Guaibasaurus.
caption: Restoration
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