Spinostropheus is a genus of small carnivorous ceratosaurian theropod dinosaur that lived in the Middle Jurassic period of Niger.In 1959, Albert-Félix de Lapparent excavated fossils near Oued Timmersöi, west of In Tedreft in the Agadez desert. Among the finds were the remains of a theropod.In 1960, de Lapparent, based on these, named a second species of Elaphrosaurus: Elaphrosaurus gautieri.