Pub Date : 2022-01-02DOI: 10.1080/0269249X.2022.2047793
G. González Garraza, Patricia Rodríguez
In this study, we report new observations on the distribution of the invasive diatom Didymosphenia geminata on the island of Tierra del Fuego, southern Patagonia. We present new findings as well as data collected by the monitoring programme of the Government of the Tierra del Fuego. Didymosphenia geminata was first reported from the island in 2013, in the watershed of the Rio Grande, northeast of the island. In 2017, it was found in the Lapataia River, within the Tierra del Fuego National Park. More recently, we detected its presence at two more sites; one in Lake Fagnano, and in the Arroyo Grande, near the city of Ushuaia. Hence, in eight years, this invasive diatom has spread and reached the southern part of the island despite prevention measures applied in protected areas since 2014. Although D. geminata is already in Tierra de Fuego, the island is home to many water bodies with high conservation value. Monitoring the range expansion of this invasive diatom should continue since prevention is the only tool to prevent further expansion. This is particularly important because Ushuaia, in the southern part of the island, is a port from which many tourist companies depart for Antarctica, a continent not yet impacted by D. geminata.
{"title":"Updated distribution of the diatom Didymosphenia geminata (Lyngbye) Schmidt in Tierra del Fuego, Patagonia","authors":"G. González Garraza, Patricia Rodríguez","doi":"10.1080/0269249X.2022.2047793","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2047793","url":null,"abstract":"In this study, we report new observations on the distribution of the invasive diatom Didymosphenia geminata on the island of Tierra del Fuego, southern Patagonia. We present new findings as well as data collected by the monitoring programme of the Government of the Tierra del Fuego. Didymosphenia geminata was first reported from the island in 2013, in the watershed of the Rio Grande, northeast of the island. In 2017, it was found in the Lapataia River, within the Tierra del Fuego National Park. More recently, we detected its presence at two more sites; one in Lake Fagnano, and in the Arroyo Grande, near the city of Ushuaia. Hence, in eight years, this invasive diatom has spread and reached the southern part of the island despite prevention measures applied in protected areas since 2014. Although D. geminata is already in Tierra de Fuego, the island is home to many water bodies with high conservation value. Monitoring the range expansion of this invasive diatom should continue since prevention is the only tool to prevent further expansion. This is particularly important because Ushuaia, in the southern part of the island, is a port from which many tourist companies depart for Antarctica, a continent not yet impacted by D. geminata.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47975629","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 : 2022-01-02DOI: 10.1080/0269249X.2022.2043448
Mateusz Rybak, A. Glushchenko, A. Witkowski, H. LANGE-BERTALOT, M. Kulikovskiy
The genus Orthoseira Thwaites contains centric diatoms typically inhabiting marginal-aquatic or terrestrial habitats. The high morphological plasticity of representatives of the genus and their occurrence in rarely studied terrestrial habitats complicates an overall assessment of their biodiversity and the distribution of particular species. This study presents a description of four new species of this genus from Southeast Asia and Easter Island. They include: O. radiata M.Rybak, Glushchenko & Kulikovskiy sp. nov., O. distincteareolata M.Rybak, Glushchenko & Kulikovskiy sp. nov., O. cylindrica M.Rybak, Glushchenko & Kulikovskiy sp. nov. and Orthoseira rapanuiensis M.Rybak, Witkowski & Lange-Bertalot sp. nov. Additionally, we attempt to provide a solution to the confused taxonomical history of Liparogyra circularis Ehrenberg and provide the first detailed description of Orthoseira tropica (Krasske) Metzeltin & Lange-Bertalot.
{"title":"Diversity of the genus Orthoseira Thwaites (Bacillariophyceae) from Southeast Asia and Rapa Nui Island with descriptions of four new taxa","authors":"Mateusz Rybak, A. Glushchenko, A. Witkowski, H. LANGE-BERTALOT, M. Kulikovskiy","doi":"10.1080/0269249X.2022.2043448","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2043448","url":null,"abstract":"The genus Orthoseira Thwaites contains centric diatoms typically inhabiting marginal-aquatic or terrestrial habitats. The high morphological plasticity of representatives of the genus and their occurrence in rarely studied terrestrial habitats complicates an overall assessment of their biodiversity and the distribution of particular species. This study presents a description of four new species of this genus from Southeast Asia and Easter Island. They include: O. radiata M.Rybak, Glushchenko & Kulikovskiy sp. nov., O. distincteareolata M.Rybak, Glushchenko & Kulikovskiy sp. nov., O. cylindrica M.Rybak, Glushchenko & Kulikovskiy sp. nov. and Orthoseira rapanuiensis M.Rybak, Witkowski & Lange-Bertalot sp. nov. Additionally, we attempt to provide a solution to the confused taxonomical history of Liparogyra circularis Ehrenberg and provide the first detailed description of Orthoseira tropica (Krasske) Metzeltin & Lange-Bertalot.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41650767","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 : 2022-01-02DOI: 10.1080/0269249X.2022.2044911
A. Danz, J. Kociolek
Light, scanning electron and focused ion beam microscope observations are presented for four new species of the diatom genus Orthoseira Thwaites. Three species, O. mauiana sp. nov., O. loweana sp. nov. and O. hawaiiensis are described from Maui (Hawaiian Islands), and one species, O. oregoniana sp. nov., is described from Oregon, USA. These four species all possess carinoportulae, the feature that diagnoses the genus, but differ in many other characters, including presence and types of spines, caverns, and pore fields. We compare and contrast these species with each other, and other species currently assigned to the genus. We also compare the different morphologies with other genera proposed, but not currently recognized, such as Liparogyra Ehrenberg, Stephanosira Ehrenberg, and Porocyclia Ehrenberg, and consider the systematic relationships of these groups within Orthoseira.
{"title":"Four new Orthoseira Thwaites species from Maui, Hawaii, and the Columbia River Gorge, Oregon, with comments on frustular morphology in the genus","authors":"A. Danz, J. Kociolek","doi":"10.1080/0269249X.2022.2044911","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2044911","url":null,"abstract":"Light, scanning electron and focused ion beam microscope observations are presented for four new species of the diatom genus Orthoseira Thwaites. Three species, O. mauiana sp. nov., O. loweana sp. nov. and O. hawaiiensis are described from Maui (Hawaiian Islands), and one species, O. oregoniana sp. nov., is described from Oregon, USA. These four species all possess carinoportulae, the feature that diagnoses the genus, but differ in many other characters, including presence and types of spines, caverns, and pore fields. We compare and contrast these species with each other, and other species currently assigned to the genus. We also compare the different morphologies with other genera proposed, but not currently recognized, such as Liparogyra Ehrenberg, Stephanosira Ehrenberg, and Porocyclia Ehrenberg, and consider the systematic relationships of these groups within Orthoseira.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44532888","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 : 2022-01-02DOI: 10.1080/0269249X.2022.2033327
A. Beauger, C. E. Wetzel, O. Voldoire, Elisabeth Allain, V. Breton, D. Miallier, L. Ector
Light and scanning electron microscope observations on the genus Fontina gen. nov. from a thermo-mineral spring of the Massif Central (France) are presented. Based on morphology, the new genus shows features that have not been described previously, such as the stria pattern, interrupted at the valve face/mantle junction and composed of one long, slit-like areola on both valve face and mantle. Externally, areolae are closed by hymenes. Fontina arverna sp. nov. is described as the typus generis of Fontina. This new genus was compared with some similar freshwater genera such as Adlafia, Chamaepinnularia, Genkalia, Germainiella, Microfissurata and Nupela. So far, we are unable to establish an evolutionary link or cladistic association with currently known genera. The new genus is described from a sampling site characterized by high conductivity and high carbonate concentration, brackish conditions and whose water originates deep in the crust (high lithium concentration).
本文报道了法国中部地块热矿泉中的Fontina gen. 11 .的光镜和扫描电镜观察结果。在形态学上，新属显示出以前没有描述过的特征，如条纹图案，在阀面/地幔交界处中断，在阀面和地幔上由一个长而裂缝状的乳晕组成。在外部，乳晕被处女膜封闭。Fontina arverna sp. 11 .被描述为Fontina的典型属。将该属与Adlafia、Chamaepinnularia、Genkalia、Germainiella、Microfissurata和Nupela等淡水属进行了比较。到目前为止，我们还不能与目前已知的属建立进化联系或分支关系。这个新属是在一个具有高电导率和高碳酸盐浓度、半咸水条件和水起源于地壳深处(高锂浓度)的采样地点描述的。
{"title":"Fontina Gen. nov. (Bacillariophyta): a new diatom genus from a thermo-mineral spring of the French Massif Central (France)","authors":"A. Beauger, C. E. Wetzel, O. Voldoire, Elisabeth Allain, V. Breton, D. Miallier, L. Ector","doi":"10.1080/0269249X.2022.2033327","DOIUrl":"https://doi.org/10.1080/0269249X.2022.2033327","url":null,"abstract":"Light and scanning electron microscope observations on the genus Fontina gen. nov. from a thermo-mineral spring of the Massif Central (France) are presented. Based on morphology, the new genus shows features that have not been described previously, such as the stria pattern, interrupted at the valve face/mantle junction and composed of one long, slit-like areola on both valve face and mantle. Externally, areolae are closed by hymenes. Fontina arverna sp. nov. is described as the typus generis of Fontina. This new genus was compared with some similar freshwater genera such as Adlafia, Chamaepinnularia, Genkalia, Germainiella, Microfissurata and Nupela. So far, we are unable to establish an evolutionary link or cladistic association with currently known genera. The new genus is described from a sampling site characterized by high conductivity and high carbonate concentration, brackish conditions and whose water originates deep in the crust (high lithium concentration).","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42823619","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 : 2021-12-08DOI: 10.1080/0269249x.2021.1999859
J. Soininen, Vilja Tupola, Inka Voutilainen, M. Cantonati, Anette Teittinen
{"title":"Diatom biogeography in freshwaters – new insights from between-region comparisons and the role of unmeasured environmental factors","authors":"J. Soininen, Vilja Tupola, Inka Voutilainen, M. Cantonati, Anette Teittinen","doi":"10.1080/0269249x.2021.1999859","DOIUrl":"https://doi.org/10.1080/0269249x.2021.1999859","url":null,"abstract":"","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49611565","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 : 2021-10-02DOI: 10.1080/0269249X.2021.2001381
Anna Plikk, J. Risberg, K. Helmens
An overview of the diatom flora of the last interglacial (Eemian) lacustrine gyttja deposit at Sokli, northeastern Finland is presented together with descriptions including photomicrographs of resting spores similar to the Aulacoseira islandica-skvortzowii group, not found in recent material from Europe. Comparisons are made with literature data on similar taxa. The morphology of the resting spores (e.g., the number of striae and areolae in 10 µm) links them to the A. islandica-skvortzowii group, but the lack of vegetative cells in the Sokli record makes the determination of true synonymy difficult. The presence of spores similar/related to the A. islandica-skvortzowii group in the Sokli Eemian palaeolake may reflect a more widespread distribution of this group in the past.
{"title":"Diatom assemblages from an Eemian palaeolake in Northern Europe with morphological observations of rare Aulacoseira sp. resting spores","authors":"Anna Plikk, J. Risberg, K. Helmens","doi":"10.1080/0269249X.2021.2001381","DOIUrl":"https://doi.org/10.1080/0269249X.2021.2001381","url":null,"abstract":"An overview of the diatom flora of the last interglacial (Eemian) lacustrine gyttja deposit at Sokli, northeastern Finland is presented together with descriptions including photomicrographs of resting spores similar to the Aulacoseira islandica-skvortzowii group, not found in recent material from Europe. Comparisons are made with literature data on similar taxa. The morphology of the resting spores (e.g., the number of striae and areolae in 10 µm) links them to the A. islandica-skvortzowii group, but the lack of vegetative cells in the Sokli record makes the determination of true synonymy difficult. The presence of spores similar/related to the A. islandica-skvortzowii group in the Sokli Eemian palaeolake may reflect a more widespread distribution of this group in the past.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45246645","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 : 2021-10-02DOI: 10.1080/0269249X.2021.1986137
Nagisa Mayama, S. Mayama
The surface structures of diatom valves have been primarily studied using scanning electron microscopy (SEM), while the frustule shape and internal cellular structures have been elucidated in cross-sections by transmission electron microscopy (TEM). However, ultrathin sections can show neither the part of the whole frustule that is cut nor reflect the relationship between the sectioned portion and the surrounding structure. Therefore, we developed a simple method for obtaining a clean cleavage surface of the frustule. In this method, a drop of diatom suspension was frozen on a custom-made bundle of metal joints pre-soaked in liquid nitrogen, followed by sample preparation for SEM. The three-dimensional (3D) structure of the entire frustule and cross-sectional features, such as the thickness of the valve and bands, the angle of projection, and the internal structures of the areolae, raphe systems, and isolated pores, were visible within each half of the cleaved frustule. Applying this method shortly after cell division revealed differences in the silica deposition profiles between parental and newly forming valves at the corresponding sites. The utility of the information obtained from the cleaved frustule is discussed.
{"title":"A simple method for making transverse cleavages of diatom frustules for scanning electron microscopy and its application","authors":"Nagisa Mayama, S. Mayama","doi":"10.1080/0269249X.2021.1986137","DOIUrl":"https://doi.org/10.1080/0269249X.2021.1986137","url":null,"abstract":"The surface structures of diatom valves have been primarily studied using scanning electron microscopy (SEM), while the frustule shape and internal cellular structures have been elucidated in cross-sections by transmission electron microscopy (TEM). However, ultrathin sections can show neither the part of the whole frustule that is cut nor reflect the relationship between the sectioned portion and the surrounding structure. Therefore, we developed a simple method for obtaining a clean cleavage surface of the frustule. In this method, a drop of diatom suspension was frozen on a custom-made bundle of metal joints pre-soaked in liquid nitrogen, followed by sample preparation for SEM. The three-dimensional (3D) structure of the entire frustule and cross-sectional features, such as the thickness of the valve and bands, the angle of projection, and the internal structures of the areolae, raphe systems, and isolated pores, were visible within each half of the cleaved frustule. Applying this method shortly after cell division revealed differences in the silica deposition profiles between parental and newly forming valves at the corresponding sites. The utility of the information obtained from the cleaved frustule is discussed.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47461761","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 : 2021-10-02DOI: 10.1080/0269249X.2021.2010808
D. Avendaño, M. Caballero
Lake Chalco is one of the few lakes in Mexico that has a long, continuous sedimentary sequence covering the Upper Pleistocene (> 150 000 yrs). The diatom content of its lacustrine sediments includes a variety of centric species. In particular, the sediments dating to Marine Isotope Stage 5 (MIS5) were alternately dominated by four Cyclotella spp: C. meneghiniana Kützing, C. quillensis Bailey, and two new species which are described here: C. poyeka and C. tlalocii. These two new Cyclotella spp. resemble C. stylorum Brightwell, because of the presence of marginal chambers. Nevertheless, the new species from Lake Chalco have a different structure of the marginal chambers and marginal fultoportulae with three satellite pores. Cyclotella poyeka and C. tlalocii differ from each other by the relative proportion of the central area to valve face diameter, the central fultoportula arrangement, and the striation pattern. Ecological affinities of the four Cyclotella species in the MIS5 sediments from Lake Chalco are discussed based on their modern distribution (for C. meneghiniana and C. quillensis) and their fossil assemblages (for C. quillensis, C. tlalocii and C. poyeka), leading to the conclusion that C. tlalocii was a freshwater species while C. meneghiniana, C. quillensis, and C. poyeka thrived in saline conditions.
{"title":"Cyclotella (Bacillariophyceae) species present in sediments dating to Marine Isotope Stage 5 from Lake Chalco, central Mexico, with special reference to two new species: Cyclotella poyeka and Cyclotella tlalocii","authors":"D. Avendaño, M. Caballero","doi":"10.1080/0269249X.2021.2010808","DOIUrl":"https://doi.org/10.1080/0269249X.2021.2010808","url":null,"abstract":"Lake Chalco is one of the few lakes in Mexico that has a long, continuous sedimentary sequence covering the Upper Pleistocene (> 150 000 yrs). The diatom content of its lacustrine sediments includes a variety of centric species. In particular, the sediments dating to Marine Isotope Stage 5 (MIS5) were alternately dominated by four Cyclotella spp: C. meneghiniana Kützing, C. quillensis Bailey, and two new species which are described here: C. poyeka and C. tlalocii. These two new Cyclotella spp. resemble C. stylorum Brightwell, because of the presence of marginal chambers. Nevertheless, the new species from Lake Chalco have a different structure of the marginal chambers and marginal fultoportulae with three satellite pores. Cyclotella poyeka and C. tlalocii differ from each other by the relative proportion of the central area to valve face diameter, the central fultoportula arrangement, and the striation pattern. Ecological affinities of the four Cyclotella species in the MIS5 sediments from Lake Chalco are discussed based on their modern distribution (for C. meneghiniana and C. quillensis) and their fossil assemblages (for C. quillensis, C. tlalocii and C. poyeka), leading to the conclusion that C. tlalocii was a freshwater species while C. meneghiniana, C. quillensis, and C. poyeka thrived in saline conditions.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43168584","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 : 2021-10-02DOI: 10.1080/0269249X.2021.2020907
David M. Williams, B. Van de Vijver
This short paper discusses two new synonyms of Ulnaria vitrea: Synedra mesocampa Brébisson in Kützing and Synedra tenuis Kützing. The data generated herein are based on original material and form a contribution to the taxonomic clarification of species in the genus Ulnaria. Both names discussed have barely been noticed since their original description and then usually considered as synonyms of Ulnaria ulna. Some additional notes on other relevant names are included, such as Synedra putealis O’Meara and Synedra tenuis var. subtilis (Kützing) Brun.
{"title":"Studies on type material from Kützing’s diatom collection V – two new synonyms of Ulnaria vitrea (Kützing) E. Reichardt: Synedra mesocampa Brébisson in Kützing and Synedra tenuis Kützing","authors":"David M. Williams, B. Van de Vijver","doi":"10.1080/0269249X.2021.2020907","DOIUrl":"https://doi.org/10.1080/0269249X.2021.2020907","url":null,"abstract":"This short paper discusses two new synonyms of Ulnaria vitrea: Synedra mesocampa Brébisson in Kützing and Synedra tenuis Kützing. The data generated herein are based on original material and form a contribution to the taxonomic clarification of species in the genus Ulnaria. Both names discussed have barely been noticed since their original description and then usually considered as synonyms of Ulnaria ulna. Some additional notes on other relevant names are included, such as Synedra putealis O’Meara and Synedra tenuis var. subtilis (Kützing) Brun.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43463471","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 : 2021-10-02DOI: 10.1080/0269249X.2021.2025151
J. Kociolek, Q. Liu, A. Danz
We examine and describe the frustular morphology of the diatom originally described as Melosira radiato-sinuata var. yunnanica from a wet wall in Yunnan Province, China, based on light and scanning electron microscopy. This diatom has carinoportulae present in the central portion of the valve, and prominent caverns present internally around the periphery of the valves. The valve mantle height varies. Based on these features M. radiato-sinuata var. yunnanica is transferred to the genus Orthoseira and recognized as a distinct species. It is compared to other, similar ‘centric’ diatoms. Several other, similar taxa are also formally transferred to the genus Orthoseira, including M. radiato-sinuata, and Melosira undulata var. triocellata. ‘Orthoseira sp. #2' sensu Spaulding and Kociolek is formally described as a new species. A discussion of the morphological diversity within the genus Orthoseira is presented.
基于光学和扫描电子显微镜，我们研究并描述了来自中国云南省湿壁的硅藻最初被描述为Melosira radiato-sinuata var. yunnanica的晶体形态。硅藻瓣的中央部分有齿状突起，瓣周围的内部有明显的空洞。阀套高度变化。基于这些特征，我们将其归入直叶蝉属，认为它是一个独特的种。将它与其他类似的“中心”硅藻进行比较。其他几个类似的分类群也被正式划归到正形虫属，包括M. radiato-sinuata和Melosira波动型变种三胞虫。“Orthoseira sp. #2”的sense spulding和Kociolek被正式描述为一个新物种。讨论了形态多样性的属内的直立木提出。
{"title":"New and interesting diatoms from the Shimen Wetwalls, Yunnan Province, China. I. Valve morphology of Melosira radiato-sinuata var. yunnanica Chen (Bacillariophyta: Melosirales) from Yunnan Province, China, with comments on its systematic position","authors":"J. Kociolek, Q. Liu, A. Danz","doi":"10.1080/0269249X.2021.2025151","DOIUrl":"https://doi.org/10.1080/0269249X.2021.2025151","url":null,"abstract":"We examine and describe the frustular morphology of the diatom originally described as Melosira radiato-sinuata var. yunnanica from a wet wall in Yunnan Province, China, based on light and scanning electron microscopy. This diatom has carinoportulae present in the central portion of the valve, and prominent caverns present internally around the periphery of the valves. The valve mantle height varies. Based on these features M. radiato-sinuata var. yunnanica is transferred to the genus Orthoseira and recognized as a distinct species. It is compared to other, similar ‘centric’ diatoms. Several other, similar taxa are also formally transferred to the genus Orthoseira, including M. radiato-sinuata, and Melosira undulata var. triocellata. ‘Orthoseira sp. #2' sensu Spaulding and Kociolek is formally described as a new species. A discussion of the morphological diversity within the genus Orthoseira is presented.","PeriodicalId":11199,"journal":{"name":"Diatom Research","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2021-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45729264","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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