Elaphrosaurus or “lightweight lizard” is a genus of carnivorous dinosaur from the Late Jurassic Period. It lived in what is now the Kimmeridgian state of Tanzania. Its skeleton was found in the Tendaguru Beds of Tanzania. A related animal was found in the Morrison Formation of the western United States. Most fossils of theropods found have only been fragments, until the discovery of a single nearly complete skeleton of Elaphrosaurus. It did not contain the skull.
Elaphrosaurus was about 20 feet long. It was slender and had a long neck, possibly for digging into carrion. It stood about 5 feet tall and weighed nearly 460 pounds. It is thought that this animal could run fast as its shin bone was longer than the thigh bone.