Cyanobacteria are photo–oxygenic prokaryotes present in nearly all ecosystems, where they are important in global oxygen, carbon, and nitrogen cycles. They are often recognized as the harbingers of eutrophication in freshwater systems and are increasingly being noted as nuisance species in marine ecosystems such as coral reefs. In recent years, cyanobacteria have been intensely studied due to their toxicity, harmful bloom formation, and because their distribution and abundance are expected to increase with climate change. Nevertheless, for all of their importance, many gaps in our knowledge of cyanobacteria remain: the distribution, dispersal, and biogeography of these microorganisms are still not understood. Until 1994 little attention was paid to tropical cyanobacteria and their diversity, despite some harmful invasive species having their putative origins in tropical habitats. However, more practiced articulation and research has recently uncovered previously undescribed biodiversity, and in turn changed our knowledge of the evolutionary relationships within the Cyanobacteria. The purpose of this paper is to describe the challenges of working with the cyanobacteria and to review what we know of them from tropical habitats.
{"title":"ReviewUnderestimated cyanobacterial diversity: trends and perspectives of research in tropical environments","authors":"P. Dvořák, P. Hašler, D. Casamatta, A. Poulíčková","doi":"10.5507/fot.2021.009","DOIUrl":"https://doi.org/10.5507/fot.2021.009","url":null,"abstract":"Cyanobacteria are photo–oxygenic prokaryotes present in nearly all ecosystems, where they are important in global oxygen, carbon, and nitrogen cycles. They are often recognized as the harbingers of eutrophication in freshwater systems and are increasingly being noted as nuisance species in marine ecosystems such as coral reefs. In recent years, cyanobacteria have been intensely studied due to their toxicity, harmful bloom formation, and because their distribution and abundance are expected to increase with climate change. Nevertheless, for all of their importance, many gaps in our knowledge of cyanobacteria remain: the distribution, dispersal, and biogeography of these microorganisms are still not understood. Until 1994 little attention was paid to tropical cyanobacteria and their diversity, despite some harmful invasive species having their putative origins in tropical habitats. However, more practiced articulation and research has recently uncovered previously undescribed biodiversity, and in turn changed our knowledge of the evolutionary relationships within the Cyanobacteria. The purpose of this paper is to describe the challenges of working with the cyanobacteria and to review what we know of them from tropical habitats.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44330156","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}
{"title":"Studies on type material from Kützing's diatom collection III: Synedra splendens (Kütz.) Kütz., Synedra aequalis (Kütz.) Kütz. and a note on Synedra obtusa W.Sm.","authors":"David M. Williams, B. Van de Vijver","doi":"10.5507/fot.2021.004","DOIUrl":"https://doi.org/10.5507/fot.2021.004","url":null,"abstract":"","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47519893","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}
Y. Liu, Ziyi Jiang, J. Kociolek, Xinxin Lu, Yawen Fan
Three distinctive species of the diatom genus Iconella Jurilj were described from tropical areas of China. These new species all have the canal raphe extending around valve margins, keel raised off the valve surface forming wings, fenestrae obvious and alar canals that are uniformly porous. Together these features suggest these species should be assigned to the newly re–established genus Iconella. Here we describe Iconella shiwana Yan Liu, Ziyi Jiang et Kociolek sp. nov., Iconella pseudoconstricta Yan Liu, Ziyi Jiang et Kociolek sp. nov. and Iconella uniformis Yan Liu, Ziyi Jiang et Kociolek sp. nov., all described on the basis of light and scanning electron microscope observations from material collected from Hainan and Southern Guangxi Provinces. Iconella shiwana differs from other taxa by its isopolar valves and broadly round apices, tri– to quadriseriate short striae and large elliptical hyaline area in the valve center. I. pseudoconstricta is also isopolar, but it has acute ends and a constricted valve center. I. uniformis has heteropolar valves with a broadly rounded head pole and acute foot pole, a large spine is present near the head pole, and hook–like helictoglossae present at the foot pole. Our previous studies in tropical areas in China showed the diatom flora includes endemic taxa, although additional investigations are needed to explore and describe the abundant biodiversity there.
本文报道了中国热带硅藻Iconella Jurilj属的三个特有种。这些新物种都有围绕瓣膜边缘延伸的管缝，从瓣膜表面凸起的龙骨形成翅膀，明显的开窗和均匀多孔的翼管。总之，这些特征表明这些物种应该被归入新建立的Iconella属。在这里，我们描述了石瓦纳Iconella shiwana Yan Liu，Ziyi Jiang et Kociolek sp.nov.，拟构造Iconella Yan Liu，Ziyi Jiang et Kociolek sp.nova.和均匀Iconella uniformis Yan LiuZiyi Jianget Kociolik sp.nv..，所有这些都是基于从海南和广西南部收集的材料的光学和扫描电子显微镜观察而描述的。石瓦纳Iconella shiwana与其他分类群的不同之处在于其等极瓣和宽圆形的顶端，三至四线状的短条纹和瓣中心的大椭圆形透明区。I.假肌也是等极性的，但它有尖锐的末端和收缩的瓣膜中心。I.uniformis具有异极瓣，具有宽圆形的头极和锐尖的足极，头极附近有一个大棘，足极处有钩状螺旋舌。我们之前在中国热带地区的研究表明，硅藻植物群包括特有类群，尽管还需要进一步的调查来探索和描述那里丰富的生物多样性。
{"title":"New species of Iconella Jurilj (Bacillariophyta) from tropical areas of China","authors":"Y. Liu, Ziyi Jiang, J. Kociolek, Xinxin Lu, Yawen Fan","doi":"10.5507/fot.2021.006","DOIUrl":"https://doi.org/10.5507/fot.2021.006","url":null,"abstract":"Three distinctive species of the diatom genus Iconella Jurilj were described from tropical areas of China. These new species all have the canal raphe extending around valve margins, keel raised off the valve surface forming wings, fenestrae obvious and alar canals that are uniformly porous. Together these features suggest these species should be assigned to the newly re–established genus Iconella. Here we describe Iconella shiwana Yan Liu, Ziyi Jiang et Kociolek sp. nov., Iconella pseudoconstricta Yan Liu, Ziyi Jiang et Kociolek sp. nov. and Iconella uniformis Yan Liu, Ziyi Jiang et Kociolek sp. nov., all described on the basis of light and scanning electron microscope observations from material collected from Hainan and Southern Guangxi Provinces. Iconella shiwana differs from other taxa by its isopolar valves and broadly round apices, tri– to quadriseriate short striae and large elliptical hyaline area in the valve center. I. pseudoconstricta is also isopolar, but it has acute ends and a constricted valve center. I. uniformis has heteropolar valves with a broadly rounded head pole and acute foot pole, a large spine is present near the head pole, and hook–like helictoglossae present at the foot pole. Our previous studies in tropical areas in China showed the diatom flora includes endemic taxa, although additional investigations are needed to explore and describe the abundant biodiversity there.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47052851","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}
During a survey on freshwater epilithic diatoms from subtropical lotic environments belonging to the Cascavel River microbasin, Paraná State, Brazil, we observed populations of a new Nupela Vyverman et Compère species. Morphological and meristic analyses were performed using light and scanning electron microscopy, resulting in the description of Nupela semifasciata sp. nov. This species is characterized by elliptic–lanceolate valves containing subcapitate apices in larger individuals and broadly rostrate–rounded apices in smaller ones, while the length/width ratio gradually decreases as the individuals become smaller. The central area unilaterally reaches the margin and always interrupts the row of areolae on the valve mantle. The valve mantle is externally composed of a second row of areolae near the apices. We cross–checked information with similar Nupela taxa, highlighting the main features that separate them. Nupela semifasciata was found in streams with acidic–neutral pH, low conductivity and low to high nutrient concentrations.
在对巴西巴拉那州卡斯卡维尔河微流域亚热带激流环境中的淡水表石器时代硅藻进行调查期间，我们观察到了一个新的Nupela Vyverman et Compère物种的种群。使用光学和扫描电子显微镜进行了形态和分生组织分析，从而描述了半筋膜Nupela semipaciata sp.nov。该物种的特征是椭圆形-披针形的瓣叶，较大的个体含有近皮囊状的顶端，较小的个体具有宽喙圆形的顶端，而长度/宽度比随着个体变小而逐渐减小。中心区域单方面到达边缘，并总是中断阀套上的一排乳晕。瓣膜套在外部由靠近顶端的第二排乳晕组成。我们将信息与类似的Nupela分类群进行了交叉检查，强调了将它们分开的主要特征。在酸性-中性pH值、低电导率和低至高营养浓度的溪流中发现了半筋膜女排。
{"title":"Nupela semifasciata (Bacillariophyceae), a new species from subtropical lotic environments in Western Paraná State, Brazil","authors":"Mailor Wellinton Wedig Amaral, G. Medeiros, Vanessa Daufenbach, Morgana Suszek Gonçalves, Thelma Alvim Veiga Ludwig, Norma Catarina Bueno","doi":"10.5507/fot.2021.002","DOIUrl":"https://doi.org/10.5507/fot.2021.002","url":null,"abstract":"During a survey on freshwater epilithic diatoms from subtropical lotic environments belonging to the Cascavel River microbasin, Paraná State, Brazil, we observed populations of a new Nupela Vyverman et Compère species. Morphological and meristic analyses were performed using light and scanning electron microscopy, resulting in the description of Nupela semifasciata sp. nov. This species is characterized by elliptic–lanceolate valves containing subcapitate apices in larger individuals and broadly rostrate–rounded apices in smaller ones, while the length/width ratio gradually decreases as the individuals become smaller. The central area unilaterally reaches the margin and always interrupts the row of areolae on the valve mantle. The valve mantle is externally composed of a second row of areolae near the apices. We cross–checked information with similar Nupela taxa, highlighting the main features that separate them. Nupela semifasciata was found in streams with acidic–neutral pH, low conductivity and low to high nutrient concentrations.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46351131","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}
B. Van de Vijver, David M. Williams, M. Kelly, Amelie Jarlman, C. E. Wetzel, L. Ector
Based on literature data, Fragilaria capucina seems to be a widespread species, often split into a large number of varieties. In the present study, the original type material was investigated, together with the type material of two varieties, originally described by Grunow as the var. acuta and the var. acuminata and the type material of Fragilaria sandellii and F. nevadensis. The results of all morphological analyses indicated that F. capucina is clearly different from the other species based on the number of rimoportulae, valve outline and spine morphology. The var. acuta and var. acuminata are conspecific with F. nevadensis and are added as synonyms of the latter. Additionally, three unidentified populations from Sweden and the United Kingdom that showed some resemblance to F. capucina were analysed. Using detailed LM and SEM observations, these three populations showed sufficient morphological differences from all other Fragilaria species and are therefore described as new for science: F. malouana Van de Vijver et Jarlman nov. sp., F. battarbeeana Van de Vijver, M.Kelly, C.E.Wetzel et Ector nov. sp. and F. ennerdalensis Van de Vijver, M.Kelly, C.E.Wetzel et Ector nov. sp.
根据文献资料显示，七叶树似乎是一个分布广泛的物种，经常分裂成大量的变种。在本研究中，对原始型材料、Grunow最初描述为尖变种和渐尖变种的两个品种的型材料以及Fragilaria sandellii和F.nevadensis的型材料进行了研究。所有形态学分析结果表明，从边缘孔的数量、瓣口轮廓和脊椎形态来看，卡朴藻与其他物种有明显的不同。尖尖变种和尖尖尖变种与奈瓦登氏F.nevadensis是同种的，并作为后者的同义词添加。此外，还分析了来自瑞典和联合王国的三个与卡朴西娜有一定相似之处的不明种群。通过详细的LM和SEM观察，这三个种群与所有其他Fragilaria物种表现出足够的形态差异，因此被描述为科学上的新物种：F.malouana Van de Vijver et Jarlman nov.sp.、F.battarbeeana Van de Vij ver、M.Kelly、C.E.Wetzel et Ector nov.sp.和F.ennerdalensis Van de Vijever、M.Kelly、C.E.Wetzell et Ector nov.sp。
{"title":"Analysis of some species resembling Fragilaria capucina (Fragilariaceae, Bacillariophyta)","authors":"B. Van de Vijver, David M. Williams, M. Kelly, Amelie Jarlman, C. E. Wetzel, L. Ector","doi":"10.5507/fot.2021.001","DOIUrl":"https://doi.org/10.5507/fot.2021.001","url":null,"abstract":"Based on literature data, Fragilaria capucina seems to be a widespread species, often split into a large number of varieties. In the present study, the original type material was investigated, together with the type material of two varieties, originally described by Grunow as the var. acuta and the var. acuminata and the type material of Fragilaria sandellii and F. nevadensis. The results of all morphological analyses indicated that F. capucina is clearly different from the other species based on the number of rimoportulae, valve outline and spine morphology. The var. acuta and var. acuminata are conspecific with F. nevadensis and are added as synonyms of the latter. Additionally, three unidentified populations from Sweden and the United Kingdom that showed some resemblance to F. capucina were analysed. Using detailed LM and SEM observations, these three populations showed sufficient morphological differences from all other Fragilaria species and are therefore described as new for science: F. malouana Van de Vijver et Jarlman nov. sp., F. battarbeeana Van de Vijver, M.Kelly, C.E.Wetzel et Ector nov. sp. and F. ennerdalensis Van de Vijver, M.Kelly, C.E.Wetzel et Ector nov. sp.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48107289","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}
Fangfang Cai, Gongliang Yu, Yuchen Liu, Yuan-Zhi Sun, Renhui Li
The present study described two new Nostoc species, Nostoc favosum (CHAB5709, CHAB5713, and CHAB5714) and Nostoc mirabile (CHAB5756 and CHAB5784) based on the polyphasic approach combining morphological, genetic and ecological characteristics. Five investigated strains were found to possess morphological features of the Nostoc genus. Results showed that the 16S rRNA gene sequences of these five strains displayed ≥ 95%, and ≤ 98% similarity to the genus Nostoc. The 16S rRNA gene phylogenetic analysis inferred using bayesian inference, maximum-likelihood and neighbour-joining methods placed these five strains on two separate nodes away from other Nostoc species. The 16S-23S rRNA internal transcribed spacer (ITS) secondary structure of two new species showed a unique pattern of D1-D1', Box-B and V3 helix, which distinguished them from other Nostoc species. And the two species were further established by percent dissimilarity of ITS between another Nostoc species.
{"title":"Description of two new species of cstylefrom China based on thecstyle","authors":"Fangfang Cai, Gongliang Yu, Yuchen Liu, Yuan-Zhi Sun, Renhui Li","doi":"10.5507/fot.2021.011","DOIUrl":"https://doi.org/10.5507/fot.2021.011","url":null,"abstract":"The present study described two new Nostoc species, Nostoc favosum (CHAB5709, CHAB5713, and CHAB5714) and Nostoc mirabile (CHAB5756 and CHAB5784) based on the polyphasic approach combining morphological, genetic and ecological characteristics. Five investigated strains were found to possess morphological features of the Nostoc genus. Results showed that the 16S rRNA gene sequences of these five strains displayed ≥ 95%, and ≤ 98% similarity to the genus Nostoc. The 16S rRNA gene phylogenetic analysis inferred using bayesian inference, maximum-likelihood and neighbour-joining methods placed these five strains on two separate nodes away from other Nostoc species. The 16S-23S rRNA internal transcribed spacer (ITS) secondary structure of two new species showed a unique pattern of D1-D1', Box-B and V3 helix, which distinguished them from other Nostoc species. And the two species were further established by percent dissimilarity of ITS between another Nostoc species.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42982168","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}
G. Marquardt, Denise C. Bicudo, C. Bicudo, M. Ledru, L. Ector, C. E. Wetzel
A new monoraphid diatom species appeared successively in paleolimnological records from a Quaternary sediment core (1.5±0.1 Ma) retrieved from Colonia basin (Brazilian Coastal Plain, Atlantic Forest, Sao Paulo Metropolitan Region), and is formally described as Planothidium scrobiculatum sp. nov. We studied the new species through light and scanning electron microscopy and discussed its similarity to other members of the genus. The new species has a unique combination of morphological features that allow its separation from all other species in the genus: (1) lanceolate valve outline with cuneate apices, (2) multiseriate striae composed of two to four rows of irregular sized areolae on the rapheless sternum valve (SV), not interrupted at the valve mantle junction, and (3) arrangement of areolae on the valve mantle, grouped in 3 or 4 rows, each composed of 2 to 3 areolae on the SV. Nevertheless, the new species main diagnostic feature is the occurrence of numerous, unusual, small shallow depressions externally located on the SV along the axial area, cavum, and virgae. As a result, P. scrobiculatum is different from similar species under LM and SEM by some evident characters or a combination of characters. This study contributes to the knowledge of the so far understudied biodiversity of microorganisms of tropical regions. In addition, the above-mentioned diversity patterns and the wealth of new diatom taxa inside and around the Colonia basin (many yet to be described) suggest that further samplings from other localities may provide an insight into its habitat preferences and range, since this area is an exceptional biological entity, worthy of further study.
{"title":"Planothidium scrobiculatum sp. nov. (Bacillariophyta), a new monoraphid diatom from freshwater Pleistocene deposits of South America","authors":"G. Marquardt, Denise C. Bicudo, C. Bicudo, M. Ledru, L. Ector, C. E. Wetzel","doi":"10.5507/FOT.2020.016","DOIUrl":"https://doi.org/10.5507/FOT.2020.016","url":null,"abstract":"A new monoraphid diatom species appeared successively in paleolimnological records from a Quaternary sediment core (1.5±0.1 Ma) retrieved from Colonia basin (Brazilian Coastal Plain, Atlantic Forest, Sao Paulo Metropolitan Region), and is formally described as Planothidium scrobiculatum sp. nov. We studied the new species through light and scanning electron microscopy and discussed its similarity to other members of the genus. The new species has a unique combination of morphological features that allow its separation from all other species in the genus: (1) lanceolate valve outline with cuneate apices, (2) multiseriate striae composed of two to four rows of irregular sized areolae on the rapheless sternum valve (SV), not interrupted at the valve mantle junction, and (3) arrangement of areolae on the valve mantle, grouped in 3 or 4 rows, each composed of 2 to 3 areolae on the SV. Nevertheless, the new species main diagnostic feature is the occurrence of numerous, unusual, small shallow depressions externally located on the SV along the axial area, cavum, and virgae. As a result, P. scrobiculatum is different from similar species under LM and SEM by some evident characters or a combination of characters. This study contributes to the knowledge of the so far understudied biodiversity of microorganisms of tropical regions. In addition, the above-mentioned diversity patterns and the wealth of new diatom taxa inside and around the Colonia basin (many yet to be described) suggest that further samplings from other localities may provide an insight into its habitat preferences and range, since this area is an exceptional biological entity, worthy of further study.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"21 1","pages":"53-61"},"PeriodicalIF":2.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46621222","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}
The taxonomy of coccoid cyanobacteria has been largely revised in recent years. In this study, a novel coccoid cyanobacterial strain was isolated from a watercourse at the Poyang Lake Model Research Base, Jiangxi province, Eastern China. A polyphasic approach combining morphological and molecular testing was used to characterize this strain referred to as CHAB 4018. Regarding colonial form and cellular spatial arrangement, this strain was morphologically similar to strains of the genus Eucapsis. The maximum 16S rRNA gene sequence similarity of this strain to the currently described cyanobacteria genera was 93.40%, exceeding the cutoff for genus delimitation in bacteriology. Furthermore, a phylogenetic tree based on 16S rRNA gene sequences indicated that strain CHAB 4018 formed a unique clade in the family Chroococcaceae and was phylogenetically close to the recently established genus Cryptococcum but distant from the Chroococcus 'sensu stricto' clade and from Eucapsis. Thus, a novel coccoid cyanobacterial genus with a new species is here described as Neochroococcus gongqingensis. A large phylogenetic tree using more strains suggested phylogenetic intermixture of Chroococcus-like and Eucapsis-like cyanobacteria, suggesting the need for further studies on the phylogeny and taxonomy of coccoid cyanobacteria.
{"title":"Neochroococcus gongqingensis gen. et sp. nov., a new member of coccoid cyanobacteria from a watercourse, Eastern China","authors":"Ruozhen Geng, Yilang Wang, Fangfang Cai, Yige Zhang, Ping Yang, Guofei Dai, Renhui Li, Gongliang Yu","doi":"10.5507/FOT.2020.015","DOIUrl":"https://doi.org/10.5507/FOT.2020.015","url":null,"abstract":"The taxonomy of coccoid cyanobacteria has been largely revised in recent years. In this study, a novel coccoid cyanobacterial strain was isolated from a watercourse at the Poyang Lake Model Research Base, Jiangxi province, Eastern China. A polyphasic approach combining morphological and molecular testing was used to characterize this strain referred to as CHAB 4018. Regarding colonial form and cellular spatial arrangement, this strain was morphologically similar to strains of the genus Eucapsis. The maximum 16S rRNA gene sequence similarity of this strain to the currently described cyanobacteria genera was 93.40%, exceeding the cutoff for genus delimitation in bacteriology. Furthermore, a phylogenetic tree based on 16S rRNA gene sequences indicated that strain CHAB 4018 formed a unique clade in the family Chroococcaceae and was phylogenetically close to the recently established genus Cryptococcum but distant from the Chroococcus 'sensu stricto' clade and from Eucapsis. Thus, a novel coccoid cyanobacterial genus with a new species is here described as Neochroococcus gongqingensis. A large phylogenetic tree using more strains suggested phylogenetic intermixture of Chroococcus-like and Eucapsis-like cyanobacteria, suggesting the need for further studies on the phylogeny and taxonomy of coccoid cyanobacteria.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"21 1","pages":"44-52"},"PeriodicalIF":2.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45138220","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}
Y. Liu, J. Kociolek, Quanxi Wang, Lixin Li, Yawen Fan
Biodiversity "hotspot" areas have been shown to possess unique diatom floras. During our diatom studies of some of these types of areas in China, samples were collected from Hainan and Guangdong Provinces, and four species from 4 different genera are proposed as new to science based on LM and SEM observations. These new taxa are Eunotia dinghunsis Liu & Kociolek, sp. nov., Brachysira subirawanae Kociolek & Liu, sp. nov., Microcostatus muscus Liu & Kociolek, sp. nov. and Iconella sanyatangum Liu & Kociolek, sp. nov. In addition, a species known previously only from Java and Sumatra, Pinnularia rivularis Hustedt, was observed, and herein we provide LM and the first SEM observations of this species.
{"title":"New and interesting freshwater diatoms (Bacillariophyceae) from a biodiversity hotspot area in China","authors":"Y. Liu, J. Kociolek, Quanxi Wang, Lixin Li, Yawen Fan","doi":"10.5507/FOT.2020.013","DOIUrl":"https://doi.org/10.5507/FOT.2020.013","url":null,"abstract":"Biodiversity \"hotspot\" areas have been shown to possess unique diatom floras. During our diatom studies of some of these types of areas in China, samples were collected from Hainan and Guangdong Provinces, and four species from 4 different genera are proposed as new to science based on LM and SEM observations. These new taxa are Eunotia dinghunsis Liu & Kociolek, sp. nov., Brachysira subirawanae Kociolek & Liu, sp. nov., Microcostatus muscus Liu & Kociolek, sp. nov. and Iconella sanyatangum Liu & Kociolek, sp. nov. In addition, a species known previously only from Java and Sumatra, Pinnularia rivularis Hustedt, was observed, and herein we provide LM and the first SEM observations of this species.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"21 1","pages":"16-33"},"PeriodicalIF":2.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41882491","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}
Maximiliano Barbosa, D. Berthold, Forrest W. Lefler, H. Iv
Florida is a diverse region that supports abundant cyanobacterial diversity, especially in terrestrial environments. To exploit this environment for cyanobacterial diversity, several greenhouses from central Florida were sampled to identify common nuisance and contaminating algae. Most of the algae observed were mat forming, covering nursery pots, plants, and equipment which were macro- and microscopically morphologically analogous to Brasilonema. Although macroscopic thallus morphology was similar among the samples, microscopic morphological characteristics such as size, color, and sheath formation were disparate. To uncover the cryptic diversity, mats were processed for species isolation, culture, and molecular taxonomic identification. A total of eleven Brasilonema strains were isolated into culture and systematically identified using 16S rRNA and 16S-23S rRNA ITS sequences. Based on morphology and molecular data, five species of Brasilonema were found and three are new to science: B. fioreae, B. santannae, and B. wernerae.
{"title":"Diversity of the genus Brasilonema (Nostocales, Cyanobacteria) in plant nurseries of central Florida (USA) with the description of three new species: B. fioreae sp. nov., B. santannae sp. nov. and B. wernerae sp. nov.","authors":"Maximiliano Barbosa, D. Berthold, Forrest W. Lefler, H. Iv","doi":"10.5507/FOT.2020.019","DOIUrl":"https://doi.org/10.5507/FOT.2020.019","url":null,"abstract":"Florida is a diverse region that supports abundant cyanobacterial diversity, especially in terrestrial environments. To exploit this environment for cyanobacterial diversity, several greenhouses from central Florida were sampled to identify common nuisance and contaminating algae. Most of the algae observed were mat forming, covering nursery pots, plants, and equipment which were macro- and microscopically morphologically analogous to Brasilonema. Although macroscopic thallus morphology was similar among the samples, microscopic morphological characteristics such as size, color, and sheath formation were disparate. To uncover the cryptic diversity, mats were processed for species isolation, culture, and molecular taxonomic identification. A total of eleven Brasilonema strains were isolated into culture and systematically identified using 16S rRNA and 16S-23S rRNA ITS sequences. Based on morphology and molecular data, five species of Brasilonema were found and three are new to science: B. fioreae, B. santannae, and B. wernerae.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"21 1","pages":"82-99"},"PeriodicalIF":2.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42604361","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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