 Acrocanthosaurus ( / ˌækroʊˌkænθəˈsɔːrəs / ak @-@ ro @-@ KAN @-@ thə @-@ SAWR @-@ əs ; meaning " high @-@ spined lizard " ) is a genus of theropod dinosaur that existed in what is now North America during the Aptian and early Albian stages of the Early Cretaceous . Like most dinosaur genera , Acrocanthosaurus contains only a single species , A. atokensis . Its fossil remains are found mainly in the U.S. states of Oklahoma , Texas , and Wyoming , although teeth attributed to Acrocanthosaurus have been found as far east as Maryland . 
