Acrocanthosaurus triassicus (Stovall & Langston 1950; Albian, Early Cretaceous; 11.5m) was a large theropod arising from Allosaurus close to Giganotosaurus. The neural spines were very tall, convergent with those in Spinosaurus. The posterior dentary was very deep.
Stovall JW and Langston W 1950. Acrocanthosaurus atokensis, a new genus and species of Lower Cretaceous Theropoda from Oklahoma. American Midland Naturalist. American Midland Naturalist, Vol. 43, No. 3. 43 (3): 696–728.
