Benthic origin and earliest evolution of the first planktonic foraminifera after the Cretaceous/Palaeogene boundary mass extinction
Benthic origin and earliest evolution of the first planktonic foraminifera after the Cretaceous/Palaeogene boundary mass extinction
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DOI：
10.1080/08912963.2015.1119133
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发表时间：
2017-01-01
影响因子：
1.4
通讯作者：
Arz, Jose A.
中科院分区：
文献类型：
--
作者：
Arenillas, Ignacio;Arz, Jose A.
关于最早期大坪期浮游有孔虫的起源和演化，有几种假说。大多数专家认为，它们起源于一些机会主义的浮游有孔虫物种，主要是Guembelitria和Hedbergella属，它们通常被认为是白垩纪/古近纪（K/Pg）边界大灭绝的幸存者。然而，早期Danian的Guembelitria和Hedbergella标本在形态上仍然与相关的parvularugogoglobigerinids（即Parvularugogoglobigerina和Palaeoglobigerina）分离，这是K/Pg边界事件后出现的第一个轮旋有孔虫。最有可能的替代方案是底栖起源的parvularugogoglobigerinids，这将是一致的分子系统发育研究，提出了几个情节的底栖-浮游过渡的浮游有孔虫的进化历史。对来自El Kef剖面和其他突尼斯剖面的材料的回顾支持了先前的假设，即基于测试和孔的形态和壁纹理的相似性，bulimid属Caucasina是第一个小红血球属（即Parvularugogoglobigerina longiapertura和Palaeoglobigerina alticonusa）的祖先。在K/Pg界线后约3-5 kyr出现的Caucasinids和parvularugogoglobigerinids之间的中间形态模式被归属于Pseudocaucasina前代属. nov. sp. nov.
There are several hypotheses on the origin and evolution of the earliest Danian planktonic foraminifera. Most experts suggest that they descended from a few opportunist planktonic foraminifera species, mainly of the genera Guembelitria and Hedbergella, which are usually considered to be survivors of the Cretaceous/Paleogene (K/Pg) boundary mass extinction. Nevertheless, early Danian specimens of Guembelitria and Hedbergella remained morphologically well separated from the associated parvularugoglobigerinids (i.e. Parvularugoglobigerina and Palaeoglobigerina), the first trochospiral planktonic foraminifera appearing after the K/Pg boundary event. The most likely alternative is a benthic origin for the parvularugoglobigerinids, which would be consistent with molecular phylogenetic studies that have suggested several episodes of benthic-planktonic transitions in the evolutionary history of planktonic foraminifera. A review of material from the El Kef section and other Tunisian sections supports the previous hypothesis that the buliminid genus Caucasina is the ancestor of the first parvularugoglobigerinids (i.e. Parvularugoglobigerina longiapertura and Palaeoglobigerina alticonusa), on the basis of similarities in test and apertural morphologies and wall texture. The intermediate morphotypes between caucasinids and parvularugoglobigerinids, which appeared approximately 3-5 kyr after the K/Pg boundary, are assigned to Pseudocaucasina antecessor gen. nov. sp. nov.