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Late early Miocene caviomorph rodents from Laguna del Laja (∼37° S), Cura-Mallín Formation, south-central Chile
Journal of South American Earth Sciences ( IF 1.7 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jsames.2020.102658
Andrés Solórzano , Alfonso Encinas , Alejandro Kramarz , Gabriel Carrasco , Germán Montoya-Sanhueza , René Bobe

Abstract Despite recent efforts, the paleodiversity of the Neogene mammals in Chile remains poorly known, with several putative new species awaiting description. For example, previous studies suggest that the early to late Miocene mammalian assemblages from the Laguna del Laja fossiliferous locality (Cura-Mallin and Trapa-Trapa formations), which crop out in the Andean Cordillera of Chile (~37°), comprise dozens of undescribed taxa. A better understanding of the taxonomic affinities of the Laguna del Laja faunas is needed, as it represents one of the few faunas known from the early to late? Miocene of the south-central Andean main range. Several specimens of caviomorphs recently recovered in late early Miocene beds of the Cura-Mallin Formation at Laguna del Laja are here described in detail, and a brief discussion of their chronological, biogeographical, and paleoenvironmental significance is also provided. Based on fragments of mandible, maxilla and isolated teeth five taxa were recognized, Phanomys mixtus Ameghino, Prolagostomus sp., Neoreomys sp., Maruchito nov. sp.?, and Luantus sompallwei nov. sp. The radiometric ages of the fossil-bearing horizons, constrained between 17.7 and 16.4 Ma, as well as the common species (P. mixtus) and genera (Prolagostomus and Neoreomys) indicate that the fauna here reported belongs to the Santacrucian SALMA. Finally, our finding preliminary suggests the predominance of rather open habitats in the Cura-Mallin Formation during this time, but also a widely distributed late Early Miocene caviomorph fauna along the southern Andes, in both intra-arc and foreland basins.

中文翻译:

来自 Laguna del Laja(南纬 37°),Cura-Mallín 组,智利中南部的晚期早中新世 caviomorph 啮齿动物

摘要 尽管最近做出了努力,但智利新近纪哺乳动物的古多样性仍然知之甚少,有几个推定的新物种有待描述。例如,之前的研究表明,来自 Laguna del Laja 化石区(Cura-Mallin 和 Trapa-Trapa 地层)的早到晚中新世哺乳动物组合,在智利的安第斯山脉(~37°)中出现,包括数十个未描述的分类群。需要更好地了解 Laguna del Laja 动物群的分类相似性,因为它代表了从早期到晚期已知的少数动物群之一?安第斯山脉中南部的中新世。此处详细描述了最近在 Laguna del Laja 的 Cura-Mallin 组晚期早中新世岩层中发现的几个 caviomorphs 标本,并简要讨论了它们的年代顺序,还提供了生物地理和古环境意义。根据下颌骨、上颌骨和离体牙齿的碎片,识别出五个分类群,Phanomys mixtus Ameghino、Prolagostomus sp.、Neoreomys sp.、Maruchito nov. sp.? 和 Luantus sompallwei nov. sp. 含化石层的辐射年龄限制在 17.7 到 16.4 Ma 之间,以及常见物种 (P. mixtus) 和属 (Prolagostomus 和 Neoreomys) 表明这里报告的动物群属于 Santacrucian SALMA。最后,我们的初步发现表明,在此期间,Cura-Mallin 组中相当开放的栖息地占主导地位,但在弧内和前陆盆地沿安第斯山脉南部也有广泛分布的早中新世晚期鱼形动物群。根据下颌骨、上颌骨和离体牙齿的碎片,识别出五个分类群,Phanomys mixtus Ameghino、Prolagostomus sp.、Neoreomys sp.、Maruchito nov. sp.? 和 Luantus sompallwei nov. sp. 含化石层的辐射年龄限制在 17.7 到 16.4 Ma 之间,以及常见物种 (P. mixtus) 和属 (Prolagostomus 和 Neoreomys) 表明这里报告的动物群属于 Santacrucian SALMA。最后,我们的初步发现表明,在此期间,Cura-Mallin 组中相当开放的栖息地占主导地位,但在弧内和前陆盆地沿安第斯山脉南部也有广泛分布的晚期早中新世鱼形动物群。根据下颌骨、上颌骨和离体牙齿的碎片,识别出五个分类群,Phanomys mixtus Ameghino、Prolagostomus sp.、Neoreomys sp.、Maruchito nov. sp.? 和 Luantus sompallwei nov. sp. 含化石层的辐射年龄限制在 17.7 到 16.4 Ma 之间,以及常见物种 (P. mixtus) 和属 (Prolagostomus 和 Neoreomys) 表明这里报告的动物群属于 Santacrucian SALMA。最后,我们的初步发现表明,在此期间,Cura-Mallin 组中相当开放的栖息地占主导地位,但在弧内和前陆盆地沿安第斯山脉南部也有广泛分布的晚期早中新世鱼形动物群。和 Luantus sompallwei 11 月。sp. 含化石层的辐射年龄限制在 17.7 到 16.4 Ma 之间,以及常见物种 (P. mixtus) 和属 (Prolagostomus 和 Neoreomys) 表明这里报告的动物群属于 Santacrucian SALMA。最后,我们的初步发现表明,在此期间,Cura-Mallin 组中相当开放的栖息地占主导地位,但在弧内和前陆盆地沿安第斯山脉南部也有广泛分布的早中新世晚期鱼形动物群。和 Luantus sompallwei 11 月。sp. 含化石层的辐射年龄限制在 17.7 到 16.4 Ma 之间,以及常见物种 (P. mixtus) 和属 (Prolagostomus 和 Neoreomys) 表明这里报告的动物群属于 Santacrucian SALMA。最后,我们的初步发现表明,在此期间,Cura-Mallin 组中相当开放的栖息地占主导地位,但在弧内和前陆盆地沿安第斯山脉南部也有广泛分布的晚期早中新世鱼形动物群。
更新日期:2020-10-01
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