在2008年,J. I. Canale等人在命名蠍獵龍時,提出一個系統發生學研究,以南美洲的食肉牛龍亞科為研究主題。他們發現南美洲的食肉牛龍亞科,以及肌肉龍,形成一個食肉牛龍亞科之內的次演化支,名為短吻龍類(Brachyrostra)。他們將短吻龍類的定義為:阿貝力龍科中,接近食肉牛龍,離瑪君龍較遠的物種[16]。
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