Guaibasaurus

Guaibasaurus Temporal range: Late Triassic, 216.5–212 Ma PreЄ Є O S D C P T J K Pg N ↓
Fossil skeleton (UFRGS PV0725T), with head and neck based on Herrerasaurus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Clade:	Dinosauria
Order:	Saurischia
Suborder:	†Sauropodomorpha
Family:	†Guaibasauridae
Genus:	†Guaibasaurus Bonaparte et al., 1999
Species:	†G. candelariensis
Binomial name
Guaibasaurus candelariensis Bonaparte et al., 1999

Guaibasaurus is an extinct genus of basal dinosaur known from the Triassic of Rio Grande do Sul, southern Brazil.

Guaibasaurus was originally named on the basis of the holotype, MCN PV2355, a well-preserved partial postcranial skeleton and the paratype, MCN PV2356, an articulated and nearly complete left hindlimb, which were discovered in the "Sesmaria do Pinhal 2" locality near Candelária, Rio Grande do Sul, in Brazil, in the geopark of Paleorrota. Later, two additional specimens were referred to G. candelariensis: UFRGS PV0725T is an articulated and nearly complete postcranial skeleton missing one forelimb, both feet and the neck, and MCN PV 10112 is still being unprepared block containing articulated parts and some isolated elements of which, including a partial hand. The referred materials were collected from the "Linha São Luiz" locality near the town of Faxinal do Soturno, Rio Grande do Sul, also in the geopark of Paleorrota. All specimen were collected in these two localities from the lower portion of the Caturrita Formation (Rosário do Sul Group, Paraná Basin) or alternatively the uppermost Santa Maria 2 Sequence, dating to the early Norian faunal stage of the Late Triassic, about 216.5-212 million years ago.