巨殁龙几乎与腔骨龙完全一样。葛瑞格利·保罗(Gregory S. Paul)于1993年曾建议将巨殁龙与腔骨龙合并。在2005年,亚当·耶茨(Adam Yates)提出巨殁龙可能是腔骨龙的异名[1]。于2004年,Michael A. Raath在两份论文中质疑巨殁龙是腔骨龙的异名的说法,他同时也使用原有的学名。
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