The fossil record of gondwanatherian mammaliaforms from Patagonia is represented by several species known on the basis of isolated teeth, with the single exception of a partial dentary with two molariforms of the Paleocene species Sudamerica ameghinoi. The aim of the present contribution is to describe both a fragmentary dentary (with the base of the lower incisive) and a partial upper incisor coming from the Campanian–Maastrichtian Chorrillo Formation, at the La Anita Farm, SW Santa Cruz province, Argentina. The specimens are referred to Magallanodon baikashkenke, a species previously known by isolated teeth from the Dorotea (Chile) and Chorrillo (Argentina) beds. The present discovery expands our knowledge of this mammaliaform clade.

来自巴塔哥尼亚的冈瓦纳兽类哺乳动物的化石记录由几个已知的基于孤立牙齿的物种代表，唯一的例外是具有两个古新世物种Sudamerica ameghinoi 的两个臼齿的部分齿类。本贡献的目的是描述来自阿根廷西南圣克鲁斯省 La Anita 农场的 Campanian-Maastrichtian Chorrillo 组的一个破碎的牙齿（带有下切牙的基部）和部分上切牙。这些标本被称为Magallanodon baikashkenke，一种以前已知的物种，是从 Dorotea（智利）和 Chorrillo（阿根廷）床中分离出的牙齿。目前的发现扩展了我们对这种哺乳动物进化枝的了解。