Abstract Glyptodontidae are a conspicuous lineage of Cingulata with a long evolutionary history (late Eocene to the late Pleistocene-Holocene). Quaternary forms are the best known, but in recent years the knowledge of Neogene taxa, particularly from southern South America has been greatly improved. This is especially evident for the late Miocene-Pliocene (Montehermosan and Chapadmalalan Stages; ca. 5–3.2 Ma) of the Argentine Atlantic coast. However, little is still known about the glyptodont assemblages from the Marplatan Stage (ca. 3.3–2 Ma), a key interval for the understanding of the typical Pleistocene forms. The most complete records of Marplatan Glyptodontidae of the genus Neosclerocalyptus Paula Couto (one of the most frequently recorded in the Pleistocene of southern South America) are here reported. The remains were found in the El Polvorin Formation (Olavarria, Buenos Aires Province) and represent also the most complete glyptodonts for the interval Montehermosan-Marplatan of the Argentine Atlantic coast. The comparative study reveals that Neosclerocalyptus underwent no significant morphological and morphometric changes throughout its evolution (ca. 3 Ma), except for a gradual increase in hypertrophy of the ossified nasal cartilages, which reach the maximum development in the terminal species of the latest Pleistocene, Neosclerocalyptus paskoensis. The phylogenetic analysis places Neosclerocalyptus sp. as the most basal taxon of the lineage, suggesting the anagenetic evolution of the clade. New findings currently under study show that some taxa (e.g., Plohophorus) extended their biochrons beyond the Chapadmalalan, with a strong increase of body size, and that the Marplatan was a transitional period between the Montehermonsan-Chapadmalalan and the Pleistocene, during which Neogene genera are found together with others typically Pleistocene.

中文翻译：

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Neosclerocalyptus Paula Couto (Xenarthra, Glyptodontidae) 在 Pampean 地区（阿根廷）的上新世晚期-最早的更新世：它对理解更新世 glyptodonts 进化史的贡献

摘要 Glyptodontidae是Cingulata的一个显着谱系，具有悠久的进化历史（晚始新世至晚更新世-全新世）。第四纪形式是最著名的，但近年来对新近纪分类群，特别是南美洲南部的知识有了很大的提高。这对于阿根廷大西洋沿岸的晚中新世-上新世（Montehermosan 和 Chapadmalalan 阶段；约 5-3.2 Ma）尤为明显。然而，对来自 Marplatan 阶段（约 3.3-2 Ma）的雕齿兽组合知之甚少，这是理解典型更新世形态的关键区间。此处报道了新硬毛属 Paula Couto 属 Marplatan Glyptodontidae 的最完整记录（南美洲南部更新世最常见的记录之一）。这些遗骸是在 El Polvorin 地层（布宜诺斯艾利斯省奥拉瓦里亚）中发现的，也是阿根廷大西洋沿岸 Montehermosan-Marplatan 区间最完整的雕齿兽类。对比研究表明，新硬骨鱼在其整个进化过程中（约 3 Ma）没有发生显着的形态学和形态学变化，除了骨化鼻软骨的肥大逐渐增加，在最新更新世末期达到最大发育，帕斯科新石斑鱼。系统发育分析将 Neosclerocalyptus sp。作为谱系中最基础的分类群，表明该进化枝的遗传进化。目前正在研究的新发现表明，一些分类群（例如 Plohophorus）将它们的生物年代扩展到了查帕德马拉兰之外，