Cocconeis fetscheriana sp. nov. (Bacillariophyta) from streams in California (USA) with reference to the cingulum variability within the placentuloid species complex

IF 1.9 3区生物学 Q2 MARINE & FRESHWATER BIOLOGY

Diatom Research Pub Date : 2022-04-03 DOI:10.1080/0269249X.2022.2074145

R. Stancheva

{"title":"Cocconeis fetscheriana sp. nov. (Bacillariophyta) from streams in California (USA) with reference to the cingulum variability within the placentuloid species complex","authors":"R. Stancheva","doi":"10.1080/0269249X.2022.2074145","DOIUrl":null,"url":null,"abstract":"A novel diatom species, Cocconeis fetscheriana, is described from streams in California (USA). Detailed light and scanning electron microscopy of its frustules reveal a unique combination of characters. These are a highly variable and often irregular valve outline, rapheless sternum valves with characteristic dumbbell-shaped areolae, forming 7–14 longitudinal rows per hemi-valve, a lanceolate, slightly diagonal sternum separated from the valve apices by up to four areolae, robust closed smooth valvocopula attached to sternum valve mantle by an undulate rim, and raphe valve with distinct submarginal areolae, which always circumradiate the raphe apices. Teratological forms are commonly observed in this novel species and are discussed. Environmental data and morphological comparisons with similar Cocconeis taxa with open valvocopulae are provided. The importance of detailed characterization of the cingulum structure with a particular focus on the rapheless sternum valve valvocopula as diagnostic features in Cocconeis is discussed. Examples of cingulum ultrastructure variability are included from additional undescribed Cocconeis species from another stream in California.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":"37 1","pages":"127 - 144"},"PeriodicalIF":1.9000,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Diatom Research","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1080/0269249X.2022.2074145","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

A novel diatom species, Cocconeis fetscheriana, is described from streams in California (USA). Detailed light and scanning electron microscopy of its frustules reveal a unique combination of characters. These are a highly variable and often irregular valve outline, rapheless sternum valves with characteristic dumbbell-shaped areolae, forming 7–14 longitudinal rows per hemi-valve, a lanceolate, slightly diagonal sternum separated from the valve apices by up to four areolae, robust closed smooth valvocopula attached to sternum valve mantle by an undulate rim, and raphe valve with distinct submarginal areolae, which always circumradiate the raphe apices. Teratological forms are commonly observed in this novel species and are discussed. Environmental data and morphological comparisons with similar Cocconeis taxa with open valvocopulae are provided. The importance of detailed characterization of the cingulum structure with a particular focus on the rapheless sternum valve valvocopula as diagnostic features in Cocconeis is discussed. Examples of cingulum ultrastructure variability are included from additional undescribed Cocconeis species from another stream in California.

查看原文本刊更多论文

加利福尼亚(美国)河流中的芽胞藻(bacariophyta)与胎盘样物种复合体中带带变异的关系

在美国加利福尼亚州的溪流中，描述了一种新的硅藻物种，Cocconeis fetscheriana。详细的光照和扫描电子显微镜对其截头体揭示了一种独特的特征组合。这些是高度可变且通常不规则的瓣膜轮廓，无中缝的胸骨瓣具有特征性的哑铃形乳晕，每个半瓣形成7-14排纵向，一个披针形的、稍微倾斜的胸骨与瓣尖分开多达四个乳晕，坚固的、闭合光滑的瓣瓣叶通过波状边缘附着在胸骨瓣罩上，中缝瓣具有明显的近缘乳晕，乳晕始终围绕中缝尖。在这种新物种中通常观察到畸形形式，并对其进行了讨论。提供了环境数据，并与类似的具有开放瓣叶的Cocconeis分类群进行了形态学比较。讨论了扣带结构的详细特征的重要性，特别是作为Cocconeis诊断特征的无缝胸骨瓣瓣叶。扣带超微结构变异的例子包括来自加利福尼亚州另一条溪流的其他未描述的Cocconeis物种。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.