ハプロカントサウルス
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↑ Taylor, M.P. and Naish, D. (2005). "The phylogenetic taxonomy of Diplodocoidea (Dinosauria: Sauropoda)." PaleoBios, 25(2): 1–7.
↑ Whitlock, J.A. (2011). "A phylogenetic analysis of Diplodocoidea (Saurischia: Sauropoda)." Zoological Journal of the Linnean Society, Article first published online: 12 Jan 2011. doi:10.1111/j.1096-3642.2010.00665.x