A new lithostrotian sauropod, Arackar licanantay gen. et sp. nov. is described based on a partial skeleton from the Upper Cretaceous (Campanian–Maastrichtian) beds of the Hornitos Formation, Atacama Region, northern Chile. The holotype consists of axial (cervical and dorsal vertebrae) and appendicular (humerus, femur and ischium) elements of a sub-adult specimen (ca. 6.3 m long). Autapomorphies characterizing this new titanosaur include: middle neural arches with wide and tall centroprezygapophyseal fossa + parapophyseal centroprezygapophyseal fossa (cprf + pacprf) extending on the entire anterior faces of the pedicles, but not above the neural canal, and reduced spinopostzygapophyseal laminae, shorter than the postzygapophyseal facet length. A phylogenetic analysis based on a data matrix of 87 taxa and 405 characters recovered Arackar as a derived lithostrotian titanosaur, placing it in a clade that includes Rapetosaurus + (Arackar + Isisaurus). This is the third dinosaur named from Chile and the third titanosaur from the western side of the Andes in South America.

一种新的立梭罗蜥脚类动物，阿拉卡（Arackar）licanantaygen。等 十一月 根据智利北部阿塔卡马地区霍尼托斯组上白垩统（坎潘－马斯特里赫特）地层的部分骨架进行了描述。整型由亚成人标本（长约6.3 m）的轴向（颈椎和背椎）和阑尾（肱骨，股骨和坐骨）组成。表征这种新的泰坦龙的先天形态包括：中央神经弓，中央有宽而高的百日草状足突窝+副骨节状百草状窝（cprf + pacprf）延伸在椎弓根的整个前表面上，但不在神经管上方，并且比脊椎棘突短ga突后小平面长度。基于对87个分类单元405点的字符数据矩阵的系统发生分析中回收Arackar作为衍生的立梭龙的泰坦龙，将其放置在包括Rapetosaurus  +（Arackar  +  Isisaurus）的进化枝中。这是南美第三只以智利命名的恐龙，第三只是从安第斯山脉西侧的恐龙。