Taxonomy and species diversity of Holocene pylonioid radiolarians from surface sediments of the northeastern Indian Ocean
Taxonomy and species diversity of Holocene pylonioid radiolarians from surface sediments of the northeastern Indian Ocean
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DOI：
10.26879/718
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发表时间：
2017-09
影响因子：
2
通讯作者：
Lanlan Zhang;N. Suzuki
中科院分区：
文献类型：
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作者：
Lanlan Zhang;N. Suzuki
Pylonioid放射虫在印度洋东北部的表层沉积物中表现出较高的物种多样性。它们可以作为重要的海洋学指标，在热带和亚热带海洋，但pylonioid放射虫鉴定提出了挑战，因为在不同的方向标本的外观发生重大变化。人们曾考虑过检查其内部结构以进行精确鉴定，但这种方法对于检查数千个包埋在显微镜载玻片上的幽门标本是不现实的。因此，我们已经开发了实用的方法，pylonioid放射虫鉴定透射光显微镜下安装载玻片。该程序首先确认样本相对于中心组合阴影的方向。在绝对（类型1）和相对（类型2）坐标系下确定方向后，根据外观差异识别形态组。分类学名称分配给这些形态组考虑形态变异，个体发育的变化，最重要的是，是否可以包括在这些形态组的全模和相关标本。我们的研究总共产生了10个属和34个种/亚种，其中包括3个新属（Sphaeropylolena n. gen.，球壳青霉属gen.和Qiuripylolena n. gen.）Pylonioidea总科20个新种/亚种（Larcospira teres n.例如，L.四角中心体例如，长柄巨口蚤亚种，L.猎户座;猎户座亚种，L.莫勒;例如，L.偏心的;例如，L.美叶苔属;例如，松球壳菌例如，S.细刺的;例如，伊塔木藓例如，[医]叉叶藓例如，蜗状球壳青霉例如，S.精确的;例如，S.谈之渊尼;例如，秋螺例如，Q.绒球;例如，Q.？多中心的;例如，双圆盘藻例如，C.假微孔例如，和Tholomura pilula n. sp.）。根据这一分类方案，我们证实了有限的地理分布的许多pylonioid物种。http://zoobank.org/50E1E005-7E40-4DF5-A433-4EF50F6A865E Zhang，Lanlan and Suzuki，Noritoshi. 2017.印度洋东北部表层沉积物中全新世pylonioid放射虫的分类学和物种多样性。Palaeontologia Electronica 20.3.48A：1-68 palaeo-electronica.org/content/2017/1989-taxonomy-of-holocene-pylonioid Copyright：September 2017 Paleontology Society.这是一篇开放获取的文章，根据AttributionNonCommercial-ShareAlike 4.0 International（CC BY-NC-SA 4.0）的条款分发，允许用户以任何媒介或格式复制和重新分发材料，前提是它不用于商业目的，并注明原作者和来源，如果有任何更改。creativecommons.org/licenses/by-nc-sa/4.0/Zhang & Suzuki：全新世锥虫的分类.中国科学院海洋与边缘海地质重点实验室，中国科学院南海海洋研究所，广州510301。llzhang@scsio.ac.cn铃木则俊.东北大学大学院理学研究科地球科学系，日本仙台980-8578。norinori@m.tohoku.ac.jp
Pylonioid radiolarians show high species diversity in surface sediments of the northeastern Indian Ocean. They can be applied as important oceanographic indices in tropical and subtropical oceans, but pylonioid radiolarian identification has presented challenges because of major change in the appearances of specimens in different orientations. Examination of their internal structures for precise identification has been considered, but this method is not realistic for examining thousands pylonioid specimens embedded on microscopic slides. Therefore, we have developed practical methods for pylonioid radiolarian identification under transmitted light microscopy with mounted slides. This procedure begins with confirming the orientations of specimens with respect to the shadow of the central combination. After orientations were determined under both absolute (Type 1) and relative (Type 2) coordinate systems, morphological groups were identified based on differences in appearance. Taxonomic names were allocated to these morphological groups with consideration given to morphological variations, ontogenetic changes, and most importantly, whether the holotypes and relevant specimens could be included within these morphological groups. Our study yielded a total of 10 genera and 34 species/subspecies, including three new genera (Sphaeropylolena n. gen., Sphaerolarnacillium n. gen. and Qiuripylolena n. gen.) and 20 new species/subspecies in the superfamily Pylonioidea (Larcospira teres n. sp., L. tetragonicentrum n. sp., Larcopyle buetschlii chenmuhongi n. subsp., L. buetschlii orion n. subsp., L. molle n. sp., L. eccentricanoides n. sp., L. pulchella n. sp., Sphaeropylolena laxa n. sp., S. tenellispinosa n. sp., Phorticium itakii n. sp., P. scitulum n. sp., Sphaerolarnacillium cochleatum n. sp., S. exactum n. sp., S. tanzhiyuani n. sp., Qiuripylolena chikuchik n. sp., Q. pompon n. sp., Q.? multiconcentrica n. sp., Circodiscus biorbiculus n. sp., C. pseudomicroporus n. sp., and Tholomura pilula n. sp.). Following this taxonomic scheme, we confirmed the limited geographic distribution of many pylonioid species. http://zoobank.org/50E1E005-7E40-4DF5-A433-4EF50F6A865E Zhang, Lanlan and Suzuki, Noritoshi. 2017. Taxonomy and species diversity of Holocene pylonioid radiolarians from surface sediments of the northeastern Indian Ocean. Palaeontologia Electronica 20.3.48A: 1-68 palaeo-electronica.org/content/2017/1989-taxonomy-of-holocene-pylonioid Copyright: September 2017 Paleontology Society. This is an open access article distributed under the terms of AttributionNonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0), which permits users to copy and redistribute the material in any medium or format, provided it is not used for commercial purposes and the original author and source are credited, with indications if any changes are made. creativecommons.org/licenses/by-nc-sa/4.0/ ZHANG & SUZUKI: TAXONOMY OF HOLOCENE PYLONIOID Lanlan Zhang. CAS Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China. llzhang@scsio.ac.cn Noritoshi Suzuki. Department of Earth Sciences, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. norinori@m.tohoku.ac.jp