Late Jurassic South American theropod faunas are still extremely poorly known, with large-sized ceratosaurids and megalosaurids having been identified on the basis of isolated teeth, whereas the only named taxa, Chilesaurus and Pandoravenator, are probable tetanurans of uncertain affinities. Here we describe two new specimens of medium-sized to large theropods from the Oxfordian-Kimmeridgian Cañadón Calcáreo Formation of Chubut, Argentina; an isolated and rather well-preserved anterior cervical vertebra and a very fragmented, but associated assortment of bones, including cranial and vertebral remains. Both specimens show ceratosaurian and, most probably, abelisaurid affinities. A faunal analysis underlines the relative abundance of ceratosaurs and the absence of coelurosaurs as main differences of Late Jurassic Gondwanan theropod faunas from their Laurasian counterparts. The presence of abelisaurids in both the Tendaguru Formation and the Cañadón Calcáreo Formation indicates a wide distribution of this clade already in the Late Jurassic in the Southern Hemisphere.

晚侏罗世南美兽脚亚目动物群仍然知之甚少，大型角鼻龙科和巨龙科已根据孤立的牙齿被确定，而唯一命名的分类群是智利龙和潘多瑞纳龙, 是可能的 tetanurans 不确定的亲和力。在这里，我们描述了来自阿根廷丘布特的 Oxfordian-Kimmeridgian Cañadón Calcáreo 地层的两个新的中型到大型兽脚亚目动物标本；一个孤立且保存完好的前颈椎和一个非常破碎但相关的骨骼分类，包括颅骨和椎骨遗骸。两个标本都显示出角鼻龙科和最有可能的阿贝龙科的亲缘关系。动物群分析强调了角龙类的相对丰度和虚骨龙的缺失是晚侏罗世冈瓦南兽脚类动物群与其劳亚同类的主要区别。在 Tendaguru 组和 Cañadón Calcáreo 组中都存在阿贝利龙科，表明该分支已经在南半球晚侏罗世广泛分布。