怪猎龙由卡尔(Thomas D. Carr)、威廉森(Thomas E. Williamson)、布里特(Brooks B. Britt)、史塔曼(Ken Stadtman)于2011年命名。模式种柯氏怪猎龙(T. curriei)亦是唯一已知种;属名由希腊语teras(怪兽)加上phoneus(杀手)组成,[6]种名致敬古生物学家菲力·柯里(英语:Philip J. Currie)。[7]
正模标本是破碎的头骨及部分颅后骨骼。起初归入四只不同个体,但可能其实全部属于单一只亚成体。该标本尚未完全成熟,卡尔等人估计身长6米及体重667公斤。[7]2016年,莫里纳裴雷兹和拉腊曼迪估计身长6.4米及体重1.15吨。[8]葛瑞格利·保罗(英语:Gregory S. Paul)给出更高的估计值身长8米及体重2.5吨。[9]
2021年描述了来自犹他州南部凯帕罗维兹彩虹与独角兽采石场(Rainbows and Unicorns Quarry)的怪猎龙尸骨层,显示这种动物可能是社会性群聚掠食者。化石中包含了介于4至22岁的4或5只个体,可能遭遇一场如洪水、中毒、干旱、火灾之类的大量死亡事件。全部动物都在单次短暂时间内死亡的迹象进而支持了暴龙科群居行为的论点,亚伯达龙、怪猎龙、惧龙尸骨层展现了群居行为可能普遍存在于暴龙科中。[5][11]
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