Miocene Cercopithecoidea from the Tugen Hills, Kenya
Miocene Cercopithecoidea from the Tugen Hills, Kenya
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DOI：
10.1016/j.jhevol.2010.05.005
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发表时间：
2010-11-01
影响因子：
3.2
通讯作者：
Hill, Andrew
中科院分区：
文献类型：
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作者：
Gilbert, Christopher C.;Goble, Emily D.;Hill, Andrew
图根山中新世至更新世的含盐沉积物的时间跨度至少为15.5 Ma至0.25 Ma，包括非洲其他地方未知或鲜为人知的时间段。因此，图根山矿床有可能为我们提供有关非洲动物群演变中的关键系统发育事件和长期环境变化的信息。在从这个地区收集的标本中，有许多发现对理解灵长类动物的进化已经很重要了。在这里，我们描述了额外的Cercopithecoid材料从中新世沉积在Tugen丘陵序列，包括那些从安全定年地点在Muruyur层（16-13.4马），Mpesida层（7-6.2马）和Lukeino组（类似于6.2-5.7马）。我们还评估了以前描述的材料从恩戈罗拉形成（13-8.8马）。已鉴定的分类群包括隐花古猿科属和种，参见。帕拉帕皮奥洛塔加姆，和至少两个colobines。标本归因于cf。Pp. lothagamensis将扩大该物种的地理范围超出其模式产地。此外，我们描述了与现代非洲colobines（部落：Colobina），这一发现是一致的，与以前的分子估计colobine分歧日期共享衍生字符的标本。这些colobine标本代表了现代非洲colobine辐射的一些最早的已知成员，与以前的假设相反，表明早期非洲colobine主要是树栖的，半陆生的晚中新世和上新世-更新世colobine类群是次要的运动适应。(C)2010爱思唯尔有限公司版权所有。
Miocene to Pleistocene fossiliferous sediments in the Tugen Hills span the time period from at least 15.5 Ma to 0.25 Ma, including time periods unknown or little known elsewhere in Africa. Consequently, the Tugen Hills deposits hold the potential to inform us about crucial phylogenetic events in African faunal evolution and about long-term environmental change. Among the specimens collected from this region are a number of discoveries already important to the understanding of primate evolution. Here, we describe additional cercopithecoid material from the Miocene deposits in the Tugen Hills sequence, including those from securely dated sites in the Muruyur Beds (16-13.4 Ma), the Mpesida Beds (7-6.2 Ma) and the Lukeino Formation (similar to 6.2-5.7 Ma). We also evaluate previously described material from the Ngorora Formation (13-8.8 Ma). Identified taxa include Victoriapithecidae gen. et sp. indet, cf. Parapapio lothagamensis, and at least two colobines. Specimens attributed to cf. Pp. lothagamensis would extend the species' geographic range beyond its type locality. In addition, we describe specimens sharing derived characters with modern African colobines (Tribe: Colobina), a finding that is congruent with previous molecular estimates of colobine divergence dates. These colobine specimens represent some of the earliest known members of the modern African colobine radiation and, in contrast to previous hypotheses, suggest that early African colobines were mainly arboreal and that semi-terrestrial Late Miocene and Plio-Pleistocene colobine taxa were secondarily derived in their locomotor adaptations. (C) 2010 Elsevier Ltd. All rights reserved.