Valve and ‘Stigma’ Structure and Phylogeny of an Enigmatic Cymbelloid Diatom Karthickia verestigmata Glushchenko, Kulikovskiy & Kociolek

IF 1.9 3区生物学 Q2 MARINE & FRESHWATER BIOLOGY Diatom Research Pub Date : 2022-07-03 DOI:10.1080/0269249X.2022.2101545

Ekkachai Yana, Surakit Nakkaew, J. Pekkoh, Y. Peerapornpisal, A. Tuji, M. P. Davis, Matthew L. Julius, S. Mayama

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引用次数: 2

Abstract

The epilithic diatom Karthickia verestigmata Glushchenko et al. was described from North Viet Nam and Laos. Karthickia is a monotypic genus characterized by a unique ‘stigma’ located on the secondary side of the valve with an external circular opening and opening internally by two elongated slits. In 2012 we collected a diatom population consistent with the description of K. verestigmata from the Wang Kaew Waterfall on the upper Wang River in Doi Luang National Park, Thailand. This study details its internal ‘stigma’ structure utilizing sections made with a focused ion beam and observed with a scanning electron microscopy. From the bottom of external circular hole two narrowly flat spaces expanded from the bottom of the external opening down to each inner slit, lying in a trough that is a partial extension of a stria. A phylogenetic hypothesis for Karthickia was created using multiple genes. The taxonomic status of Karthickia is discussed in the context of other genera in the Cymbellales.

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一个隐隔的类柱状硅藻Karthickia verestimata Glushchenko，Kulikovskiy和Kociolek的阀瓣和“柱头”结构及系统发育

旧石器时代的硅藻Karthickia verestimata Glushchenko等人描述于北越南和老挝。Karthickia是一个单型属，其特征是独特的“柱头”位于瓣膜的次级侧，外部有圆形开口，内部有两个细长的狭缝。2012年，我们从泰国多荣国家公园王河上游的王瀑布收集了一个与宽脊藻描述一致的硅藻种群。这项研究详细介绍了其内部“柱头”结构，利用聚焦离子束制成的切片，并用扫描电子显微镜进行观察。从外部圆孔的底部开始，两个狭窄平坦的空间从外部开口的底部向下扩展到每个内部狭缝，位于条纹的部分延伸的槽中。利用多个基因建立了卡氏菌的系统发育假说。Karthickia的分类地位是在其他属的背景下讨论的。

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来源期刊

Diatom Research 生物-海洋与淡水生物学

CiteScore

2.70

自引率

16.70%

发文量

审稿时长

>12 weeks

期刊介绍： Diatom Research is the journal of the International Society for Diatom Research. The journal is published quarterly, in March, June, September and December, and welcomes manuscripts on any aspect of diatom biology. In addition to full-length papers, short notes and reviews of recent literature are published which need not contain all the sections required for full-length papers; we see these as being necessary to record information which is of interest but which cannot be followed up in detail. Discursive “Opinion” papers are encouraged which would not necessarily follow the normal lay-out. If extremely long papers are to be offered, the author(s) should contact the editors first to discuss any problems. Book reviews, obituaries and meeting reports can be published. All papers will be subject to critical review by the editors and referees, as appropriate to their content. Papers will be accepted in English only.