1971年瓦特·庫姆斯(Walter Coombs)將倍甲龍、刺甲龍、無齒甲龍定義為包頭龍的異名,因為歸入倍甲龍的四個下頜之一與包頭龍標本的下頜一模一樣,但沒有指出其他作為異名的鑑定特徵來解釋。[7]2009年維多莉亞·奧柏爾(英語:Victoria Arbour)等人發表了倍甲龍的重新描述,認為這是一個有效的物種,並解釋之前是因為正模標本及其他包頭龍標本的破碎狀態而導致異名的觀點。[2]2011年湯普森等人證實彼此的獨立性並將倍甲龍列為魔頭繪龍的姊妹分類單元。[8]2015年奧柏爾和菲力·柯里(英語:Phillip J. Currie)將倍甲龍與包含甲龍、包頭龍、無齒甲龍、刺甲龍的演化支互成姊妹群。[9]2017年奧柏爾和艾文思則讓倍甲龍和祖魯龍互為姊妹群。[10]
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Matson, C.C. Paleoenvironments of the Upper Cretaceous Dinosaur Park Formation in southern Alberta, Canada (學位論文). University of Calgary, Calgary, AB. 2010. doi:10.11575/PRISM/18677.
Longrich, N.R. and Currie, P.J. (2009). "A microraptorine (Dinosauria–Dromaeosauridae) from the Late Cretaceous of North America." Proceedings of the National Academy of Sciences106(13): 5002–5007. doi: 10.1073/pnas.0811664106
van der Reest, A. J.; Currie, P. J. Troodontids (Theropoda) from the Dinosaur Park Formation, Alberta, with a description of a unique new taxon: implications for deinonychosaur diversity in North America. Canadian Journal of Earth Sciences. 2017, 54 (9): 919−935. Bibcode:2017CaJES..54..919V. doi:10.1139/cjes-2017-0031. hdl:1807/78296.
Funston, Gregory. Caenagnathids of the Dinosaur Park Formation (Campanian) of Alberta, Canada: anatomy, osteohistology, taxonomy, and evolution. Vertebrate Anatomy Morphology Palaeontology. 2020-07-27, 8: 105–153. ISSN 2292-1389. doi:10.18435/vamp29362.
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