戟龍以及角龍科恐龍的四肢姿勢有過不同的假設,包括前肢直立於身體之下,或是前肢呈現往兩側伸展姿勢。最近的研究提出戟龍最有可能採取兩種說法中間的蹲伏姿勢[7]。古生物學家格里高利·保羅(Gregory S. Paul),以及丹麥哥本哈根大學動物博物館的佩爾·克里斯坦森(Per Christiansen),基於可能由角龍類留下的非兩側伸展式足跡化石,提出大型角龍類如戟龍能夠以大象的方式奔跑[8]。
戟龍的第三個種,卵圓戟龍(S. ovatus),化石是發現於蒙大拿州的雙麥迪遜組,並由查爾斯·懷特尼·吉爾摩爾(Charles W. Gilmore)在1930年所命名。卵圓戟龍的化石材料有限,其中保存最好的是部分頂骨,牠們的特徵是接近中央線的一對尖刺往中央線集中,而非遠離中央線,例如亞伯達戟龍。牠們頭盾兩側分別有兩對尖刺,而非三對。與亞伯達戟龍的尖刺相比,卵圓戟龍的尖刺相當短,期中最長的僅有29.5公分[26]。2010年的重新研究認為,卵圓戟龍是個獨立的屬[5]。同年,傑克·霍納(John R. Horner)、Andrew T. McDonald將卵圓戟龍建立為獨立屬,刺叢龍(Rubeosaurus)[22]。
因為戟龍的角、尖刺與頭盾形狀特殊,使牠們很容易辨認。戟龍曾出現在早期的電影中,例如1933年的《金剛之子》(The Son of Kong)[46]、以及1969年的《暴龍關吉》(The Valley of Gwangi),在《暴龍關吉》中一隻戟龍與一隻肉食性恐龍發生打鬥[47]。在1975年的電影《被時間遺忘的土地》,德國U型潛艇裝載兩隻戟龍帶走。而迪士尼在2000年推出的電腦動畫電影《恐龍》(Dinosaur)中,則有一隻名為「Eema」的擬人化戟龍[48]。而在《侏羅紀公園》的小說中,戟龍則在公園所有恐龍名單之中,但並沒有在電影版中出現。
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