Evolution and taxonomy of the Paleogene calcareous nannofossil genus Hornibrookina

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2022-01-01 DOI:10.47894/mpal.68.1.04

J. Self‐Trail, D. Watkins, J. Pospichal, E. L. Seefelt

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引用次数: 1

Abstract

The genus Hornibrookina consists of enigmatic calcareous nannofossils that first appeared shortly after the K-Pg mass extinction. Due to their relative paucity in most published sections, specimens of this genus have not been previously studied in detail and their paleobiogeographic preferences and evolutionary history have been poorly understood. Biostratigraphic and morphometric analyses of Hornibrookina specimens from outcrops and cores from the Atlantic Ocean, the North Sea, the Southern Ocean, the Indian Ocean, North America, South America, Africa, and New Zealand resulted in a comprehensive and detailed documentation of this group of calcareous nannofossils. Biostratigraphic ranges for each species are refined and a hypothetical evolutionary lineage for this genus is proposed. Two new species (Hornibrookina gracila and Hornibrookina indistincta), two new combinations (Hornibrookina elegans and Hornibrookina australis arca) and one new subspecies (Hornibrookina australis australis) are described. Morphometric analyses prove that Hornibrookina edwardsii and Hornibrookina teuriensis are distinctly different species with biostratigraphically useful ranges. Hornibrookina apellanizii is shown to be invalid.

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古近系钙质纳米化石Hornibrookina属的演化与分类

Hornibrookina属由神秘的钙质纳米化石组成，这些化石在K-Pg大灭绝后不久首次出现。由于它们在大多数已发表的章节中相对稀少，该属的标本以前没有被详细研究过，它们的古生物地理偏好和进化历史也很少被了解。对来自大西洋、北海、南大洋、印度洋、北美、南美、非洲和新西兰的露头和岩心的Hornibrookina标本进行了生物地层学和形态计量学分析，得出了这组钙质纳米化石的全面和详细的记录。对每个物种的生物地层范围进行了细化，并提出了该属的假设进化谱系。描述了2个新种(长叶虫和模糊虫)、2个新组合(elegans和arca)和1个新亚种(Hornibrookina australis australis)。形态计量学分析证明，edwardsii和teuriensis是具有明显生物地层学意义的不同种。无球藻是无效的。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.