A. colurus the neotype of the genus Anchisaurus and the species A. polyzelus, rendering A. polyzelus and A. colurus objective synonyms (both names being based on exactly the same fossil). Broom named Gyposaurus capensis in 1911, from bones discovered in South Africa but Peter Galton renamed these Anchisaurus capensis in 1976. This species has since been reclassified again and is probably a juvenile of Massospondylus carinatus. G. sinensis was also referred here, but appears to be a distinct animal. The Navajo Sandstone of Arizona is the same age as the Portland Formation, and has produced prosauropod remains that have been referred to as Ammosaurus. However, it is possible that these actually belong to the genus Massospondylus, otherwise known only from South Africa. In the eastern Canadian province of Nova Scotia, scientists have unearthed prosauropods from the McCoy Brook Formation, which is about 200 to 197 million years old, from the Early Jurassic Hettangian stage. The Nova Scotia material provides clues about the diet of these animals. A large number of gastroliths, stones swallowed to grind up plant material in the gut, were found in the abdomen, as well as bone from the skull of a small sphenodont, Clevosaurus. This indicates that these dinosaurs were omnivorous, with a diet mainly consisting of plants but with an occasional supplement of meat. However, these remains have never been fully described or illustrated and were only tentatively referred to Ammosaurus. A further study identified them as a new taxon of sauropodomorph, Fendusaurus eldoni. Description Anchisaurus was a rather small dinosaur, with a length of just over , which helps explain why it was once mistaken for human bones. It probably weighed around . However, Marsh's species A. major (also known as Ammosaurus) was larger, from and some estimates give it a weight of up to . Gregory S. Paul estimated its length at and its weight at in 2010. According to the presence of cf. Otozoum tracks on the Connecticut Valley, Anchisaurus could reach even greater sizes. Otozoum tracks were made by a semibipedal to quadrupedal sauropodomorph close to or on the line leading toward eusauropods. Anchisaurus is one of the two sauropodomorphs recognized in the zone. Based on the four known specimens of Anchisaurus, Yates estimated that the animal measured up to in length. This matches well with the estimated average size of the adult Eubrontes track-maker in the Hartford and Deerfield basins.