Named By: J. F. Bonaparte, J. Ferigolo, and A. M. Ribeiro - 1999.
Classification: Chordata, Reptilia, Dinosauria, Saurischia, Guaibasauridae.
Species: G. candelariensis (type).
Size: Possibly up to 3 meters long.
Known locations: Brazil.
Time period: Norian of the Triassic.
Fossil representation: Almost complete and articulated post cranial skeleton and an almost complete hind limb.
Guaibasaurus is known from fairly good remains, though the skull is unknown. When first described, Guaibasaurus was considered to be a potential theropod dinosaur, though later a similarity with the primitive sauropodomorph dinosaur Saturnalia was noted, and now Guaibasaurus is usually seen as a very primitive sauropodomorph dinosaur.
- A new early Late Triassic saurischian dinosaur from Rio Grande do Sol state, Brazil. - Proceedings of the Second Gondwanan Dinosaur Symposium, National Science Museum Monographs 15:89-109. - J. F. Bonaparte, J. Ferigolo, and A. M. Ribeiro - 1999.
- A new specimen of Guaibasaurus candelariensis (basal Saurischia) from the Late Triassic Caturrita Formation of southern Brazil. - Historical Biology, 19(1): 73-82. - J. F. Bonaparte, G. Brea, C. L. Schultz & A. G. Martinelli - 2007.
- A reassessment of the basal dinosaur Guaibasaurus candelariensis, from the Late Triassic Caturrita Formation of south Brazil. - Earth and Environmental Science Transactions of the Royal Society of Edinburgh 101 (3–4): 301–332. - Max C. Langer, Jonathas S. Bittencourt & Cesar L. Schultz - 2011.
- Guaibasaurus candelariensis (Dinosauria, Saurischia) and the early origin of avian-like resting posture. - Alcheringa 36 (2): 263–267. - F. Agnolin & A. G. Martinelli - 2012.
- Dinosaur Facts and Figures: The Sauropods and Other Sauropodomorphs. New Jersey: Princeton University Press. p. 245. - Molina-Pérez & Larramendi - 2020.