在1884年,英格蘭的早白堊紀地層發現了高大的神經棘,曾經被認為非常類似高棘龍[17]。這些骨頭最初被歸類於頂棘龍,頂棘龍是種英國的獸腳類恐龍,僅發現牙齒。在1988年,葛瑞格利·保羅(Gregory S. Paul)在1988年將這些神經棘命名為高棘龍的第二個種,長棘高棘龍(Acrocanthosaurus altispinax)[18],保羅的歸類使得至少一位科學家主張頂棘龍是高棘龍的一個異名[17]。在1991年,長棘高棘龍被改建立為獨立的比克爾斯棘龍,不屬於高棘龍與頂棘龍[19]。
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