High Quality Content by WIKIPEDIA articles! Allosauroidea is a superfamily or clade of theropod dinosaurs which contains four families — the Sinraptoridae, Allosauridae, Carcharodontosauridae, and Neovenatoridae. The oldest-known allosauroid, Sinraptor dongi, appeared in the Middle Jurassic of China, and the latest-known survivor of the group is the neovenatorid Orkoraptor of the Late Cretaceous, Allosauroids had long, narrow skulls, large orbits, three-fingered hands, and usually had "horns" or ornamental crests on their heads. The most famous and best understood allosauroid is the North American genus Allosaurus

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