Four vertebrae of a plesiosaur were recovered from the Katterfeld Formation of the Aysén Basin, north of Lago General Carrera, in the Patagonian Cordillera of Chile. Plesiosaur-bearing strata have been assigned to the Hauterivian based on ammonoid biostratigraphy, in particular they are inferred to be within the “Aegocrioceras and Crioceratites zone, of late early–early late Hauterivian age, above the Favrella Americana and below the “Favrella” wilckensis zones of previous authors. The preserved elements share anatomical characteristics with elasmosaurids, Muraenosaurus leedsii and an indeterminate plesiosaur of the Agrio Formation. However, more complete material is required to elucidate the affinity of plesiosaur present in the Katterfeld Formation. This finding represents the southernmost record of plesiosaurs in the Lower Cretaceous and the first record in the Hauterivian of Chile.

在智利巴塔哥尼亚山脉的拉戈将军卡雷拉以北的艾森盆地的卡特费尔德组中发现了蛇颈龙的四块椎骨。根据菊石生物地层学，含蛇颈龙的地层已被归入Hauterivian 地层，特别是推断它们位于“ Aegocriceras and Crioceratites带，晚期早至晚期 Hauterivian 时代，高于Favrella Americana和低于“ Favrella” wilckensis以前作者的区域。保存下来的元素与薄板龙科、利兹穆雷诺龙有相同的解剖学特征以及一个不确定的阿格里奥组蛇颈龙。然而，需要更完整的材料来阐明存在于 Katterfeld 地层中的蛇颈龙的亲缘关系。这一发现代表了下白垩纪蛇颈龙最南端的记录，也是智利 Hauterivian 的第一个记录。