Abstract The knowledge on the Pleistocene biota that inhabited the Brazilian midwestern region is scarce and no data on the paleoecology of Eremotherium laurillardi from this region have been published so far. The main objective of this study is to provide information about the age and feeding ecology of that taxon from Goias state and to compare the results with other localities from the Brazilian Intertropical Region (BIR). Carbon isotope and stereomicrowear analyses were performed in a molariform from the left maxilla found in Piranhas municipality. The results include a14C AMS dating of 32,390 ± 100 (34,705-33,947 cal yr BP), and a δ13C value of −8.99‰, which indicates a generalist diet (BA = 0.96) with similar proportions of C3 (pi = 57%) and C4 (pi = 43%) plants consumed. The stereomicrowear results also suggests a mixed diet, although the high values of scratches could be associated to the significant consumption of grasses. Coarse features on the orthodentine surface indicate possible ingestion of exogenous grit due to the behavior of foraging close to or at the ground. The generalist behavior corroborates previous studies from other localities of the BIR. E. laurillardi from midwestern Brazil possibly consumed higher proportions of shrub/tree foliage, whilst in northeastern Brazil it probably had a dominant diet of C4 herbaceous plants. The distinct feeding behavior is a consequence of different climatic and environmental conditions between these regions during late Pleistocene. Our integrative study was efficient to improve the understanding about the paleoecology of this emblematic ground sloth that inhabited midwest region of the BIR during the late Pleistocene, but additional work is needed for more detailed interpretations.

中文翻译：

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来自巴西热带地区中西部地区的 Eremotherium laurillardi (LUND, 1842) 的放射性碳测年和综合古生态学（δ13C，立体微磨损）

摘要 关于居住在巴西中西部地区的更新世生物群的知识很少，迄今为止还没有关于该地区 Eremotherium laurillardi 古生态学的数据发表。本研究的主要目的是提供有关戈亚斯州该分类群的年龄和摄食生态的信息，并将结果与​​巴西热带地区 (BIR) 的其他地区进行比较。碳同位素和立体微磨损分析是在食人鱼市发现的左上颌骨的臼齿中进行的。结果包括 32,390 ± 100 (34,705-33,947 cal yr BP) 的 a14C AMS 测年和 -8.99‰ 的 δ13C 值，这表明通用饮食 (BA = 0.96) 与 C3 (pi = 57%) 和C4 (pi = 43%) 植物消耗。立体微磨损结果也表明混合饮食，尽管划痕的高价值可能与草的大量消耗有关。正牙质表面的粗糙特征表明，由于靠近地面或在地面觅食的行为，可能摄入了外源性砂砾。通才行为证实了 BIR 其他地方的先前研究。来自巴西中西部的 E. laurilardi 可能消耗更高比例的灌木/乔木树叶，而在巴西东北部，它可能以 C4 草本植物为主要食物。不同的摄食行为是更新世晚期这些地区之间不同气候和环境条件的结果。我们的综合研究有效地提高了对这种在更新世晚期居住在 BIR 中西部地区的标志性地懒的古生态学的理解，