A revised taxonomic and phylogenetic concept for the planktonic foraminifer species Globigerinoides ruber based on molecular and morphometric evidence
A revised taxonomic and phylogenetic concept for the planktonic foraminifer species Globigerinoides ruber based on molecular and morphometric evidence
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DOI：
10.1016/j.marmicro.2010.12.001
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发表时间：
2011-04-01
影响因子：
1.9
通讯作者：
Kucera, Michal
中科院分区：
文献类型：
--
作者：
Aurahs, Ralf;Treis, Yvonne;Kucera, Michal
最近的SSU rDNA序列数据的古海洋学重要的浮游有孔虫种Globigerinoides红显示存在两个不同的系统发育谱系内的形态分类群。第一谱系（G. ruber sensu stricto）包括对应于粉红色G. ruber，以及在“白色”G.橡胶（标记为Ia型、Ib型和Ib 2型）。其余两种遗传类型的G.红（白色），标记为IIa和IIb型，代表一个不同的系统发育谱系（G.红（ruber sensu lato），与Globigerinoides crucilobatus关系较近。在这里，我们结合联合收割机分子钟和形态计量学分析，阐明了形态分类群G中这两个不同谱系的分类学和系统发育意义。鲁伯。分子钟方法表明G. ruber sensu stricto谱系在中新世晚期出现分裂，G.红色（粉红色）和“白色”基因型Ia、Ib和Ib 2。这表明G. ruber先于G. ruber“假绝灭”事件发生于8 Ma，是一个不相关的种（Globigerinoides subquadratus）;红色（粉红色）谱系比化石记录中首次出现的粉红色色素要早得多。为了建立G. ruber sensu lato系统发育谱系，我们进行了形态测量（i）与已知的遗传身份的标本图片，（ii）从沉积物样品的贝壳，（iii）标本分配到G。ruber和Globigerinoides elongatus的图片;最近文献中的红色广义形态型。我们的研究结果表明，代表G。ruber sensu lato谱系与G.在最近的文献中，这些形态型与Globigerinoides elongatus的种定义是一致的。因此，我们建议将G. elongatus（sensu d 'Orbigny）应恢复并用于遗传类型IIa。名字G。红色（d 'Orbigny意义上的）应该保留给粉红色染色体标本。Ia、Ib和Ib 2型的标本需要新的种名，但我们的数据不足以提供一个形态特征将这些种与它们的姊妹种G分开。红（粉红色），除了他们的壳着色。(C)2011 Elsevier B. V.保留所有权利。
Recent SSU rDNA sequence data of the paleoceanographically important planktonic foraminifer species Globigerinoides ruber showed the presence of two distinct phylogenetic lineages within this morphotaxon. The first lineage (G. ruber sensu stricto) includes the genetic type that corresponds to pink-pigmented G. ruber, as well as three of the five genetic types recognised in individuals of "white" G. ruber (labelled Type la, Type Ib and Type Ib2). The remaining two genetic types of G. ruber (white), labelled as Types IIa and IIb, represent a distinct phylogenetic lineage (G. ruber sensu lato), closer related to Globigerinoides conglobatus. Here we combine molecular clock and morphometric analyses to shed light on the taxonomical and phylogenetic significance of the presence of these two distinct lineages within the morphotaxon G. ruber. A molecular clock approach suggests a rather recent origin of the G. ruber sensu stricto lineage in the late Miocene and a split between G. ruber (pink) and the "white" genotypes Ia, Ib and Ib2 around 6 Ma. This indicates that all records of G. ruber prior to the G. ruber "pseudo-extinction" event at 8 Ma refer to an unrelated species (Globigerinoides subquadratus) and that the G. ruber (pink) lineage is substantially older than the first appearance of the pink pigmentation in the fossil record. In order to establish the taxonomic identity of the G. ruber sensu lato phylogenetic lineage, we conducted morphometric measurements on (i) pictures of specimens with known genetic identity, (ii) shells from sediment samples, (iii) specimens assigned to G. ruber and Globigerinoides elongatus from a museum collection and (iv) pictures of G. ruber sensu lato morphotype from recent literature. Our results suggest that specimens of Type IIa that represent the G. ruber sensu lato lineage are morphologically identical to the concept of the G. ruber sensu lato morphotype in recent literature, and that these morphotypes are consistent with the species definition of Globigerinoides elongatus. We therefore propose that the name G. elongatus (sensu d'Orbigny) should be reinstated and used for the genetic Type IIa. The name G. ruber (sensu d'Orbigny) should be reserved for specimens of the pink chromotype. Specimens of Types Ia, Ib and Ib2 require new species names, but our data are not sufficient to provide a morphological character separating these species from their sister G. ruber ( pink), other than by their shell colouration. (C) 2011 Elsevier B.V. All rights reserved.