Sacisaurus

Sacisaurus ("Saci lizard") is a silesaurid dinosauriform from the Late Triassic (Norian) Caturrita Formation of southern Brazil. The scientific name, Sacisaurus agudoensis, refers to the city where the species was found, Agudo in the Rio Grande do Sul state, whereas Sacisaurus refers to Saci, a famous one-legged creature from Brazilian mythology, because among the dozens of fossil material unearthed, 35 right femora were collected whereas only 1 left femur was found.

== Characteristics == thumb|Size comparison of S. agudoensis Sacisaurus was approximately long and high, based on the largest femoral specimen. Some elements that were originally mentioned in the description study were reassigned to other taxa afterwards. Its long and strong legs indicate that it was a fast animal. The biggest teeth of the genus were just long. alt=|left|thumb|Life reconstruction of Sacisaurus agudoensis. The well-preserved jaw indicates that Sacisaurus was an herbivore, and there is a process at the tip that resembles the ornithischian predentary bone. Further research attempted to define if Sacisaurus was the oldest ornithischian dinosaur. In 2011, a cladistic analysis of some of its morphological particularities found that its closest relative was the silesaurid Diodorus, from Morocco.