One of the most fascinating research topics in the field of sauropod dinosaurs is the evolution of gigantism. In the particular case of Titanosauria, the record of multi-ton species (those exceeding 40 tons) comes mainly from Patagonia. The record of super-sized titanosaur sauropods has traditionally been extremely fragmentary, although recent discoveries of more complete taxa have revealed significant anatomical information previously unavailable due to preservation biases. In this contribution we present a giant titanosaur sauropod from the Candeleros Formation (Cenomanian, circa 98 Ma) of Neuquén Province, composed of an articulated sequence of 20 most anterior plus 4 posterior caudal vertebrae and several appendicular bones. This specimen clearly proves the presence of a second taxon from Candeleros Formation, in addition to Andesaurus, and is here considered one of the largest sauropods ever found, probably exceeding Patagotitan in size. While anatomical analysis does not currently allow us to regard it as a new species, the morphological disparity and the lack of equivalent elements with respect to coeval taxa also prevent us from assigning this new material to already known genera. A preliminary phylogenetic analysis places this new specimen at the base of the clade leading to Lognkosauria, in a polytomy with Bonitasaura. The specimen here reported strongly suggests the co-existence of the largest and middle-sized titanosaurs with small-sized rebbachisaurids at the beginning of the Late Cretaceous in Neuquén Province, indicating putative niche partitioning. This set of extremely large taxa from Patagonia has contributed to a better understanding of the phylogenetic relationships of titanosaurs, revealing the existence of a previously unknown lineage and shedding new light on body mass evolution.

蜥脚类恐龙领域最引人入胜的研究主题之一是巨型进化。在泰坦龙的特殊情况下，多吨物种（超过40吨）的记录主要来自巴塔哥尼亚。传统上，超大型的泰坦蜥脚类恐龙的记录极为零碎，尽管最近发现的更完整的分类单元已经揭示了由于保存偏见而无法获得的重要解剖信息。在这项贡献中，我们展示了来自内乌肯省Candeleros组（西诺曼尼亚，约98 Ma）的巨型钛蜥脚类恐龙，由20个最前面的前加4个尾椎和几个附生骨的关节序列组成。该标本清楚地证明，除了Candeleros组还有第二个分类单元的存在安第斯龙（Andesaurus）被认为是有史以来发现的最大的蜥脚类动物之一，其大小可能超过Patagotitan。虽然解剖学分析目前不允许我们将其视为新物种，但与形态学上的差异以及与同代分类群缺乏等效元素也使我们无法将这种新材料分配给已知的属。初步的系统发育分析将该新标本放置在通向Lognkosauria的进化枝底部，并与Bonitasaura进行了多切。此处报道的标本有力地表明，内乌肯省晚白垩世开始时，大中型泰坦龙与小型雷巴奇龙共存，表明推测的生态位分区。来自巴塔哥尼亚的这套极其庞大的分类单元有助于更好地了解泰坦龙的系统发育关系，揭示了先前未知的世系的存在，并为人体进化提供了新的思路。