Pub Date : 2024-01-17DOI: 10.1080/0269249x.2023.2274330
David M. Williams
Nicholas Edward Brown, a botanist primarily interested in the African flowering plant flora, was also an active member of the Quekett Microscopical Club. In 1933, he published a monograph on the ge...
尼古拉斯-爱德华-布朗（Nicholas Edward Brown）是一位主要研究非洲开花植物区系的植物学家，同时也是奎基特显微镜俱乐部的活跃成员。1933 年，他出版了一本关于非洲花卉植物的专著。
{"title":"Notes on the diatom collection of the Natural History Museum, London (BM) VIII: the types of Arachnoidiscus in Brown’s monograph (Brown 1933)","authors":"David M. Williams","doi":"10.1080/0269249x.2023.2274330","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2274330","url":null,"abstract":"Nicholas Edward Brown, a botanist primarily interested in the African flowering plant flora, was also an active member of the Quekett Microscopical Club. In 1933, he published a monograph on the ge...","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-01-17DOI: 10.1080/0269249x.2023.2291214
Danijela Vidaković, Ntambwe Albert Serge Mayombo, Andrea Burfeid Castellanos, Michael Kloster, Bank Beszteri
Large lowland rivers represent an important type of ecosystem that has been under a constant anthropogenic influence (industry, thermal power plants, untreated communal water, and agriculture) for ...
{"title":"Assessment of the ecological status of large lowland rivers (Sava and Tisa, Serbia) based on digital microscopic investigation of the diatom communities","authors":"Danijela Vidaković, Ntambwe Albert Serge Mayombo, Andrea Burfeid Castellanos, Michael Kloster, Bank Beszteri","doi":"10.1080/0269249x.2023.2291214","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2291214","url":null,"abstract":"Large lowland rivers represent an important type of ecosystem that has been under a constant anthropogenic influence (industry, thermal power plants, untreated communal water, and agriculture) for ...","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Although tropical montane cloud forests (TMCFs) occupy less than half of a percent of the Earth’s land surface, they are the most species-rich and species-dense ecosystems worldwide. Despite numero...
{"title":"Moss-associated diatoms from Malaysian montane cloud forest with a description of two new species","authors":"Mateusz Rybak, Łukasz Peszek, Małgorzata Bąk, Nurul Shahida Redzuan","doi":"10.1080/0269249x.2023.2261447","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2261447","url":null,"abstract":"Although tropical montane cloud forests (TMCFs) occupy less than half of a percent of the Earth’s land surface, they are the most species-rich and species-dense ecosystems worldwide. Despite numero...","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138572081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-14DOI: 10.1080/0269249x.2023.2271018
Zlatko Levkov, Dušica Zaova, Ingrid Jüttner
{"title":"Three new cymbelloid species in the genera <i>Cymbella</i> , <i>Cymbopleura</i> and <i>Delicatophycus</i> from the mineral spring Crvena Voda near Skopje, Republic of North Macedonia","authors":"Zlatko Levkov, Dušica Zaova, Ingrid Jüttner","doi":"10.1080/0269249x.2023.2271018","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2271018","url":null,"abstract":"","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134901083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-14DOI: 10.1080/0269249x.2023.2267049
James A. Nienow, Akshinthala K. S. K. Prasad
{"title":"Diatoms of the northeastern Gulf of Mexico: <i>Vallithidium</i> (Achnanthales: Achnanthidiaceae), a new monoraphid genus based on <i>Navicula marginulata</i> Cleve","authors":"James A. Nienow, Akshinthala K. S. K. Prasad","doi":"10.1080/0269249x.2023.2267049","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2267049","url":null,"abstract":"","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134901507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-07DOI: 10.1080/0269249x.2023.2261667
Sergey I. Genkal, Anton M. Glushchenko, Maria A. Gololobova
AbstractThe centric diatom species Aulacoseira konstantinovii was described from Lake Tonlé Sap (Cambodia) but was erroneously assigned to the genus Aulacoseira. Subsequently, based on a unique set of morphological characters, the genus Praecyclostephanos with the single species P. boengchmariensis was established based on the material from this lake. Examination of published data has allowed us to compare the morphology of A. konstantinovii and P. boengchmariensis and confirm their conspecificity. A new combination, Praecyclostephanos konstantinovii comb. nov., is therefore proposed.Keywords: AulacoseiraPraecyclostephanoscentric diatomsmorphologysystematicstaxonomySoutheast Asia AcknowledgementsThe work of S.I. Genkal was carried out within the institutional research project ‘Diversity, Structure and Functioning of Algal and Plant Communities in Continental Waters’ (No. 121051100099-5) of the Papanin Institute for Biology of Inland Waters RAS. The work of A.M. Glushchenko was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme No. 122042700045-3). The work of M.A. Gololobova was carried out as part of the Scientific Project of the State Order of the Government of Russian Federation to Lomonosov Moscow State University (No. 121032300080-0). We are very grateful to two anonymous reviewers for constructive and helpful comments, to Loïc Tudesque for permission to use micrographs of Praecyclostephanos boengchmariensis, and Nicholas Turland for his explanations concerning nomenclature and the Code. We are also very grateful to Eileen J. Cox for editing and linguistic corrections to the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Ministry of Science and Higher Education of the Russian Federation: [Theme Number 122042700045-3]; Scientific Project of Lomonosov Moscow State University: [Theme Number 121032300080-0]; Papanin Institute for Biology of Inland Waters RAS.: [Theme Number No. 121051100099-5].
{"title":"The conspecificity of <i>Aulacoseira konstantinovii</i> and <i>Praecyclostephanos boengchhmariensis</i> with comments on the genus <i>Praecyclostephanos</i>","authors":"Sergey I. Genkal, Anton M. Glushchenko, Maria A. Gololobova","doi":"10.1080/0269249x.2023.2261667","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2261667","url":null,"abstract":"AbstractThe centric diatom species Aulacoseira konstantinovii was described from Lake Tonlé Sap (Cambodia) but was erroneously assigned to the genus Aulacoseira. Subsequently, based on a unique set of morphological characters, the genus Praecyclostephanos with the single species P. boengchmariensis was established based on the material from this lake. Examination of published data has allowed us to compare the morphology of A. konstantinovii and P. boengchmariensis and confirm their conspecificity. A new combination, Praecyclostephanos konstantinovii comb. nov., is therefore proposed.Keywords: AulacoseiraPraecyclostephanoscentric diatomsmorphologysystematicstaxonomySoutheast Asia AcknowledgementsThe work of S.I. Genkal was carried out within the institutional research project ‘Diversity, Structure and Functioning of Algal and Plant Communities in Continental Waters’ (No. 121051100099-5) of the Papanin Institute for Biology of Inland Waters RAS. The work of A.M. Glushchenko was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme No. 122042700045-3). The work of M.A. Gololobova was carried out as part of the Scientific Project of the State Order of the Government of Russian Federation to Lomonosov Moscow State University (No. 121032300080-0). We are very grateful to two anonymous reviewers for constructive and helpful comments, to Loïc Tudesque for permission to use micrographs of Praecyclostephanos boengchmariensis, and Nicholas Turland for his explanations concerning nomenclature and the Code. We are also very grateful to Eileen J. Cox for editing and linguistic corrections to the manuscript.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis work was supported by Ministry of Science and Higher Education of the Russian Federation: [Theme Number 122042700045-3]; Scientific Project of Lomonosov Moscow State University: [Theme Number 121032300080-0]; Papanin Institute for Biology of Inland Waters RAS.: [Theme Number No. 121051100099-5].","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135540213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-17DOI: 10.1080/0269249x.2023.2265380
Joshua G. Stepanek, Tate E. Carlson, Lauren E. Rumley, Matthew L. Julius
AbstractSince its description the amphoroid diatom Amphora thumensis has confounded simple taxonomic classification having been assigned to Amphora, Cymbella, and now Halamphora. Taxonomic ambiguity around this taxon stems from its small size and reduced, often contradictory, morphological features. In this investigation, we confirm the taxonomic position of A. thumensis by presenting a four-marker molecular phylogeny for a population collected from a small spring-fed lake in the Rocky Mountains of Colorado, USA. Our phylogenetic hypothesis places A. thumensis not within the genus Halamphora, but within the deep branching lineages of Amphora. We discuss this phylogenetic hypothesis in the context of the morphological and ecological diversity of the genus and evaluate the utility of putative diagnostic characters within Amphora. In light of this new evidence, the valid name Amphora thumensis (Mayer) Krieger is identified as the preferred designation for this taxon. Consequently, we transfer the morphologically similar Halamphora parathumensis to Amphora.Keywords: Halamphora thumensistaxonomyphylogenyamphoroid diatom Disclosure statementNo potential conflict of interest was reported by the authors.Supplemental dataSupplemental data for this article can be accessed at https://doi.org/10.1080/0269249X.2023.2265380.Additional informationFundingThe authors would like to thank the Vail Valley campus of Colorado Mountain College for project funding.
{"title":"Systematic reappraisal of the diminutive <i>Amphora thumensis</i> and the transfer of <i>Halamphora parathumensis</i> to the genus <i>Amphora</i>","authors":"Joshua G. Stepanek, Tate E. Carlson, Lauren E. Rumley, Matthew L. Julius","doi":"10.1080/0269249x.2023.2265380","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2265380","url":null,"abstract":"AbstractSince its description the amphoroid diatom Amphora thumensis has confounded simple taxonomic classification having been assigned to Amphora, Cymbella, and now Halamphora. Taxonomic ambiguity around this taxon stems from its small size and reduced, often contradictory, morphological features. In this investigation, we confirm the taxonomic position of A. thumensis by presenting a four-marker molecular phylogeny for a population collected from a small spring-fed lake in the Rocky Mountains of Colorado, USA. Our phylogenetic hypothesis places A. thumensis not within the genus Halamphora, but within the deep branching lineages of Amphora. We discuss this phylogenetic hypothesis in the context of the morphological and ecological diversity of the genus and evaluate the utility of putative diagnostic characters within Amphora. In light of this new evidence, the valid name Amphora thumensis (Mayer) Krieger is identified as the preferred designation for this taxon. Consequently, we transfer the morphologically similar Halamphora parathumensis to Amphora.Keywords: Halamphora thumensistaxonomyphylogenyamphoroid diatom Disclosure statementNo potential conflict of interest was reported by the authors.Supplemental dataSupplemental data for this article can be accessed at https://doi.org/10.1080/0269249X.2023.2265380.Additional informationFundingThe authors would like to thank the Vail Valley campus of Colorado Mountain College for project funding.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136032463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-03DOI: 10.1080/0269249X.2023.2233519
C. Solak, Z. Levkov, P. Hamilton, A. Wishkerman, E. Yılmaz, M. Bąk, L. Peszek, S. Blanco
Lake Salda has a unique environment due to the presence of hydromagnesite stromatolites. Samples collected from the stromatolites contained a new diatom species, Gomphonella saldanensis sp. nov., which is described based on light and scanning electron microscopy. The main character of the taxon is its linear-lanceolate outline with a rostrate headpole and narrowly rounded footpole. The striae are strongly radiate mid-valve, becoming parallel to slightly radiate towards the poles. Elliptical Fourier and Linear Discriminant analyses indicate that there are different shape forms within the same taxon. Based on LM observations, G. saldanensis is similar to Gomphonema lagerheimii f. simplex, G. geisslerae, Gomphonella calcarea, G. olivacea, G. acsiae and G. coxiae. However, G. lagerheimii f. simplex differs with slightly radiate striae throughout the valve. Gomphonella geisslerae has a slightly undulate raphe and linear apices. Larger specimens of G. acsiae are lanceolate, clavate in smaller specimens. The remaining Gomphonella species, G. calcarea, G. coxiae and G. olivacea have broader outlines and lower stria densities.
{"title":"Description of Gomphonella saldanensis sp. nov. (Bacillariophyceae) from hydromagnesite stromatolites in Salda Lake, Turkey","authors":"C. Solak, Z. Levkov, P. Hamilton, A. Wishkerman, E. Yılmaz, M. Bąk, L. Peszek, S. Blanco","doi":"10.1080/0269249X.2023.2233519","DOIUrl":"https://doi.org/10.1080/0269249X.2023.2233519","url":null,"abstract":"Lake Salda has a unique environment due to the presence of hydromagnesite stromatolites. Samples collected from the stromatolites contained a new diatom species, Gomphonella saldanensis sp. nov., which is described based on light and scanning electron microscopy. The main character of the taxon is its linear-lanceolate outline with a rostrate headpole and narrowly rounded footpole. The striae are strongly radiate mid-valve, becoming parallel to slightly radiate towards the poles. Elliptical Fourier and Linear Discriminant analyses indicate that there are different shape forms within the same taxon. Based on LM observations, G. saldanensis is similar to Gomphonema lagerheimii f. simplex, G. geisslerae, Gomphonella calcarea, G. olivacea, G. acsiae and G. coxiae. However, G. lagerheimii f. simplex differs with slightly radiate striae throughout the valve. Gomphonella geisslerae has a slightly undulate raphe and linear apices. Larger specimens of G. acsiae are lanceolate, clavate in smaller specimens. The remaining Gomphonella species, G. calcarea, G. coxiae and G. olivacea have broader outlines and lower stria densities.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42018243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-03DOI: 10.1080/0269249x.2023.2237977
Hristina Kochoska, Cécile Chardon, Teofana Chonova, François Keck, Lenaïg Kermarrec, Floriane Larras, Estelle Lefrancois, Sinziana F. Rivera, Kálmán Tapolczai, Valentin Vasselon, Zlatko Levkov, Frédéric Rimet
Diatom species identification with DNA metabarcoding is an economical, fast and reliable alternative to identification via light microscopy for river quality monitoring. Using a short DNA sequence of the rbcL gene and ‘Diat.barcode’, a reference barcode library, enables the identification of more than 90% of the environmental sequences to species level in French rivers. But the completeness of this library is much lower in other regions, such as the tropical French overseas departments. A barcode library completion method using high-throughput sequencing data combined with microscopy count data from natural samples (Rimet et al. Citation2018) was applied and tested in rivers of Martinique and Guadeloupe (West Indies), for which only 45% of the environmental sequences could be identified to species level using Diat.barcode v9. Assigning barcodes to the most abundant species in the islands by this method is illustrated with Ulnaria goulardii and two new species belonging to Nupela and Epithemia, which are also described in this paper. The more complex situation of morphologically similar species is illustrated by reference to Gomphonema designatum and G. bourbonense. Using a combination of molecular and morphological data, their conspecificity, as G. bourbonense, is demonstrated with their reference barcodes. However, when several morphologically similar species and several environmental sequences belonging to the same clade are present, it is not possible to relate the barcodes to corresponding morphological species.Applying this method enabled the Diat.barcode library (v.10) to be updated, with 84% of the environmental sequences from the West Indies now identifiable at the species level. However, many morphological species still lack barcodes. In these cases, more classical methods, such as cell isolation, Sanger sequencing and morphological observations of cultures, must be applied.
{"title":"Filling reference libraries with diatom environmental sequences: strengths and weaknesses","authors":"Hristina Kochoska, Cécile Chardon, Teofana Chonova, François Keck, Lenaïg Kermarrec, Floriane Larras, Estelle Lefrancois, Sinziana F. Rivera, Kálmán Tapolczai, Valentin Vasselon, Zlatko Levkov, Frédéric Rimet","doi":"10.1080/0269249x.2023.2237977","DOIUrl":"https://doi.org/10.1080/0269249x.2023.2237977","url":null,"abstract":"Diatom species identification with DNA metabarcoding is an economical, fast and reliable alternative to identification via light microscopy for river quality monitoring. Using a short DNA sequence of the rbcL gene and ‘Diat.barcode’, a reference barcode library, enables the identification of more than 90% of the environmental sequences to species level in French rivers. But the completeness of this library is much lower in other regions, such as the tropical French overseas departments. A barcode library completion method using high-throughput sequencing data combined with microscopy count data from natural samples (Rimet et al. Citation2018) was applied and tested in rivers of Martinique and Guadeloupe (West Indies), for which only 45% of the environmental sequences could be identified to species level using Diat.barcode v9. Assigning barcodes to the most abundant species in the islands by this method is illustrated with Ulnaria goulardii and two new species belonging to Nupela and Epithemia, which are also described in this paper. The more complex situation of morphologically similar species is illustrated by reference to Gomphonema designatum and G. bourbonense. Using a combination of molecular and morphological data, their conspecificity, as G. bourbonense, is demonstrated with their reference barcodes. However, when several morphologically similar species and several environmental sequences belonging to the same clade are present, it is not possible to relate the barcodes to corresponding morphological species.Applying this method enabled the Diat.barcode library (v.10) to be updated, with 84% of the environmental sequences from the West Indies now identifiable at the species level. However, many morphological species still lack barcodes. In these cases, more classical methods, such as cell isolation, Sanger sequencing and morphological observations of cultures, must be applied.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135717868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-03DOI: 10.1080/0269249X.2023.2230972
Łukasz Peszek, C. Robinson, Mateusz Rybak, B. Kawecka
This paper describes a new diatom species (Orthoseira helvetica sp. nov.) found in the Swiss Alps at an elevation over 2600 m a.s.l. The diatom was recorded at the Macun plateau, Swiss National Park, from samples of terrestrial and wet semi-terrestrial mosses near the stream splash zone. The diatom has a unique set of features and is easily recognized under light and scanning electron microscopy. The most distinctive feature is the presence of a prominent silica collar in a ‘rose flower’ shape rounding each carinoportulae and an additional silica collar on the areolae (first 3–4 rows) bordering the hyaline area. The valve diameter of O. helvetica sp. nov. is 7.5–26.5 µm and possesses 2–3 (usually 3) carinoportulae. Linking spines at the valve face/mantle junction are present, having a simple basis and being triangular in shape.
本文描述了一种新的硅藻（Orthoseira helvetica sp.nov.），发现于海拔2600米以上的瑞士阿尔卑斯山 m a.s.l.在瑞士国家公园的马昆高原，从溪流飞溅区附近的陆地和潮湿的半陆地苔藓样本中记录到了硅藻。硅藻有一套独特的特征，在光学和扫描电子显微镜下很容易识别。最显著的特征是每个隆突周围都有一个突出的“玫瑰花”形状的二氧化硅项圈，在与透明质区域接壤的乳晕（前3-4排）上还有一个额外的二氧化硅项圈。helvetica sp.nov.的瓣膜直径为7.5–26.5 µm，并具有2–3个（通常为3个）隆突。瓣膜表面/地幔交界处存在连接棘，其基础简单，形状呈三角形。
{"title":"Orthoseira helvetica sp. nov. – a new diatom (Bacillariophyceae) from the Swiss Alps","authors":"Łukasz Peszek, C. Robinson, Mateusz Rybak, B. Kawecka","doi":"10.1080/0269249X.2023.2230972","DOIUrl":"https://doi.org/10.1080/0269249X.2023.2230972","url":null,"abstract":"This paper describes a new diatom species (Orthoseira helvetica sp. nov.) found in the Swiss Alps at an elevation over 2600 m a.s.l. The diatom was recorded at the Macun plateau, Swiss National Park, from samples of terrestrial and wet semi-terrestrial mosses near the stream splash zone. The diatom has a unique set of features and is easily recognized under light and scanning electron microscopy. The most distinctive feature is the presence of a prominent silica collar in a ‘rose flower’ shape rounding each carinoportulae and an additional silica collar on the areolae (first 3–4 rows) bordering the hyaline area. The valve diameter of O. helvetica sp. nov. is 7.5–26.5 µm and possesses 2–3 (usually 3) carinoportulae. Linking spines at the valve face/mantle junction are present, having a simple basis and being triangular in shape.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44581540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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