Marasuchus is a genus of archosaur from the Late Triassic of Argentina. It was a close relative to dinosaurs, and even had some of their characteristics. Some scientists believe that it might even have been covered in feather-like filaments, much like many of the theropod dinosaurs that would come after it. It was originally believed to be a species of Lagosuchus, but later research determined that it was a separate genus.

In The Land Before Time

A Marasuchus briefly appears in The Land Before Time. It is seen running away from Littlefoot's when it falls down nearby it, along with a Lagosuchus, a Euparkeria, and a Pederpes.