Laboratoire de Paléontologie, Institut des Sciences de l'Évolution de Montpellier (ISE-M, UMR 5554, CNRS/UM/IRD/EPHE), Université de Montpellier, c.c. 064, Place Eugène Bataillon, Montpellier Cedex 05, F-34095, France.
Departamento de Paleontología de Vertebrados, Museo de Historia Natural - Universidad Nacional Mayor San Marcos (MUSM), Av. Arenales, Lima 11, 1256, Peru.
J Hum Evol. 2020 Sep;146:102835. doi: 10.1016/j.jhevol.2020.102835. Epub 2020 Jul 8.
The Honda Group of La Venta, Colombia, has yielded a wide array of crown platyrrhine primates, documenting the late Middle Miocene epoch (ca. 13.1-12.6 Ma, Laventan South American Land Mammal Age). Although exceptional, this record represents only a snapshot of the evolutionary history of New World monkeys because virtually none of the primate taxa recorded at La Venta had so far been found elsewhere. We describe here few dental remains of a cebine platyrrhine discovered from Laventan deposits in the San Martín Department of Peru (Peruvian Amazonia). The primate dental specimens from that new fossil-bearing locality (TAR-31) are strongly reminiscent morphologically of the teeth of Neosaimiri fieldsi from La Venta. However, given that several aspects of the dental variability from TAR-31 are unknown, we prefer to provide an assignment with open nomenclature (i.e., N. cf. fieldsi), instead of formally referring these remains to N. fieldsi, pending the discovery of additional specimens. The occurrence of Neosaimiri in Peru, in coeval deposits of La Venta, thus represents a second and southernmost record of that low-latitude genus in the Neotropics, thereby demonstrating its wide distribution along the northwestern edge of the Pebas Mega-Wetland System, in tropical western South America.
哥伦比亚拉文塔的本田集团（Honda Group）产出了大量冠层阔鼻猴类（platyrrhine primates）化石，记录了中更新世晚期（约 1310 万至 1260 万年前，拉文塔南美的陆地哺乳动物时代）的情况。虽然这一记录很不寻常，但它仅代表了新世界猴类进化历史的一个快照，因为在拉文塔记录的灵长类中，几乎没有一种在其他地方有发现。我们在这里描述了一些从秘鲁圣马丁省（秘鲁亚马逊地区）拉文塔沉积物中发现的阔鼻猴类（platyrrhine）的牙齿遗骸。这些来自新化石产地（TAR-31）的灵长类牙齿标本在形态上与拉文塔的 Neosaimiri fieldsi 牙齿非常相似。然而，由于 TAR-31 的牙齿变异的几个方面尚不清楚，我们宁愿提供开放式命名（即 N. cf. fieldsi），而不是将这些遗骸正式归入 N. fieldsi，等待发现更多的标本。在拉文塔同期沉积物中，Neosaimiri 在秘鲁的出现代表了该低纬度属在新热带地区的第二个也是最南端的记录，从而证明了它在南美洲西部热带地区皮贝斯大湿地系统的西北边缘的广泛分布。
