 Acrocanthosaurus is classified in the superfamily <unk> within the infraorder Tetanurae . This superfamily is characterized by paired ridges on the nasal and lacrimal bones on top of the snout and tall neural spines on the neck vertebrae , among other features . It was originally placed in the family Allosauridae with Allosaurus , an arrangement also supported by studies as late as 2000 . Most studies have found it to be a member of the related family Carcharodontosauridae . 
