Theropoda
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Acrocanthosaurus was a large predatory dinosaur that lived during the Early Cretaceous in North America, roughly 113 million years ago. A relative of Giganotosaurus and Carcharodontosaurus, and somewhat more distantly to Allosaurus, it grew to 11.5 meters (38 feet) long. Acrocanthosaurus was notable for the tall neural spines running down its back, which supported either a low ridge or a muscular hump.
While several specimens of Acrocanthosaurus have been found, none of them are exceptionally complete, so this reconstruction is a composite of NCSM 14345 (“Fran”), SMU 74646, and OMNH 10146. The scale bar is based on Fran, the largest specimen known so far.
