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The Theropod Dinosaurs of the genus Allosaurus since their discovery in 1877 are perhaps one the most recognizable theropods of the whole Jurassic period (201.4 ± 0.2-145.0 Million Years ago) despite emerging only in the late Kimmeridgian stage of the Jurassic period. Growing up to 9.7 meters (32 feet) in length fully grown, Allosaurus (also known as the Lions of Jurassic) were the apex predators of most of the terrestrial ecosystems they inhabited. The only theropods from these time that were higher in the food chain were some European non-Allosauroid Theropods and other members of Allosauroidea including the much rarer Epanterias (validity debated, possibly grew fully grown up to 12 meters (40 feet) in length) and Saurophaganax (validity confirmed, fully grown reached 10.5 meters (34 feet) in length). Digital Reconstruction of an adult Allosaurus sp. By artist Frederic Wierum Image Source: https://fredthedinosaurman.artstation.com/projects/Qg0WB The Allosauroids eventually gave rise to some of the largest theropod dinosaurs known in the fossil record currently including the closely related South American genus Giganotosaurus from the Cenomanian stage of the Late Cretaceous period (99.6-95 Million Years ago) in what is now Argentina (which fully grown grew up to 12-13 meters (39-43 feet) in length). But Allosaurus itself has largely been considered to have lived only in the latest stages in Jurassic period (155-145 Million Years ago). I have found some records that might challenge this assumption!!! Digital Reconstruction of an adult Allosaurus sp. By artist Frederic Wierum Image Source: https://fredthedinosaurman.artstation.com/projects/Qg0WB

https://www.theguardian.com/science/2019/aug/05/new-dinosaur-found-hiding-in-plain-sight-in-south-african-museum?CMP=share_btn_fb&fbclid=IwAR2c3PJ3Rm2OSSY57BvPQt7tivNYZySy87Vw1OtHRgJCrj9gV3w3IwGP-mU