M. Kulikovskiy, S. Genkal, Y. Maltsev, A. Glushchenko, I. Kuznetsova, D. Kapustin, E. Gusev, N. Martynenko, J. Kociolek
: The history of the description and subsequent consideration of the diatom genus Stephanocyclus Skabitschevsky (Thalassiosirales, Bacillariophyta) is discussed. The new genus was described on the basis of a new species, S. planum Skabitschevsky, originally collected from the River Ob. However, the genus has been more or less forgotten since its initial description in 1975. Type material from Skabitschevsky’s collection has subsequently been lost. An epitype for this species is recognized from the same region as the original collection, and typified with a population from Lake Baikal and using molecular data. The population from Lake Baikal fully corresponds in terms of morphological features with the population originally investigated by Skabitschevsky. Morphology of the genus Stephanocyclus is discussed and, on the basis of an integrated molecular and morphological investigation, we propose to recognize the genus, including four species within it. Three taxa are transferred to the genus, including Cyclotella cryptica , C. gamma and C. meneghiniana. A comparison of Stephanocyclus with other cyclotelloid genera is given.
{"title":"Resurrection of the diatom genus Stephanocyclus (Coscinodiscophyceae: Stephanodiscaceae) on the basis of an integrated molecular and morphological approach","authors":"M. Kulikovskiy, S. Genkal, Y. Maltsev, A. Glushchenko, I. Kuznetsova, D. Kapustin, E. Gusev, N. Martynenko, J. Kociolek","doi":"10.5507/fot.2021.025","DOIUrl":"https://doi.org/10.5507/fot.2021.025","url":null,"abstract":": The history of the description and subsequent consideration of the diatom genus Stephanocyclus Skabitschevsky (Thalassiosirales, Bacillariophyta) is discussed. The new genus was described on the basis of a new species, S. planum Skabitschevsky, originally collected from the River Ob. However, the genus has been more or less forgotten since its initial description in 1975. Type material from Skabitschevsky’s collection has subsequently been lost. An epitype for this species is recognized from the same region as the original collection, and typified with a population from Lake Baikal and using molecular data. The population from Lake Baikal fully corresponds in terms of morphological features with the population originally investigated by Skabitschevsky. Morphology of the genus Stephanocyclus is discussed and, on the basis of an integrated molecular and morphological investigation, we propose to recognize the genus, including four species within it. Three taxa are transferred to the genus, including Cyclotella cryptica , C. gamma and C. meneghiniana. A comparison of Stephanocyclus with other cyclotelloid genera is given.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"1 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42062062","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}
: A new species, Luticola jinshaensis sp. nov. is described from Xiangjiaba reservoir in Jinsha River, China. Observations on the new species were based on light microscopy (LM) and scanning electron microscopy (SEM). Luticola jinshaensis sp. nov. is distinguished from all other species of the genus in having an unusual external areolae structure, where each areola has a cribrum recessed and ornamented with tiny, irregular projections connected with inner wall of areolae raphe. This cribrum is fragile so that the structure may become destroyed by processing of the specimens. A second feature that distinguishes this new taxon is that the deflection of the distal raphe fissures which, in most case, are first deflected towards the same side as the proximal endings and then towards the opposite side and continuing onto the mantle. Occasionally, the external distal raphe fissures are first hooked towards the same side of the proximal endings, then towards the opposite side and, finally, then bent to the same side as the proximal endings. The new species is epilithic and lives in freshwater habitats, notes on its ecology and distribution are added.
{"title":"Luticola jinshaensis sp. nov. (Bacillariophyta), a new freshwater species from Jinsha River, China","authors":"L. Yang, P. Yu, Quanxi Wang, J. Kociolek, Q. You","doi":"10.5507/fot.2021.021","DOIUrl":"https://doi.org/10.5507/fot.2021.021","url":null,"abstract":": A new species, Luticola jinshaensis sp. nov. is described from Xiangjiaba reservoir in Jinsha River, China. Observations on the new species were based on light microscopy (LM) and scanning electron microscopy (SEM). Luticola jinshaensis sp. nov. is distinguished from all other species of the genus in having an unusual external areolae structure, where each areola has a cribrum recessed and ornamented with tiny, irregular projections connected with inner wall of areolae raphe. This cribrum is fragile so that the structure may become destroyed by processing of the specimens. A second feature that distinguishes this new taxon is that the deflection of the distal raphe fissures which, in most case, are first deflected towards the same side as the proximal endings and then towards the opposite side and continuing onto the mantle. Occasionally, the external distal raphe fissures are first hooked towards the same side of the proximal endings, then towards the opposite side and, finally, then bent to the same side as the proximal endings. The new species is epilithic and lives in freshwater habitats, notes on its ecology and distribution are added.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46822626","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}
Bing Liu, YANG-YAN Zhou, S. Blanco, David M. Williams
Delicatophycus wulingensis sp. nov., D. qinghainensis sp. nov., and D. menyuanensis sp. nov., are described, illustrated, and compared to similar taxa. Two types of apical pore fields (APFs) in the genus Cymbella are defined. The three new Delicatophycus all possess the type II APF found in some species of Cymbella, i.e. the APF is divided by the distal raphe fissure into two areas, one larger than the other. They also share a further three distinct features: variable central dorsal portion of valve, stigmata, and a notch on the dorsal side of the distal raphe fissure. Since there are many species of Delicatophycus without APFs, such as D. sinensis M.J. Wynne, D. williamsii M.J. Wynne and D. chongqingensis M.J. Wynne; D. williamsii and D. liuweii Li both possess stigmata, thus proposed diagnostic characters for Delicatophycus are the tilde–shaped areolae and the dorsally curved distal fissures.
{"title":"Three new species of Delicatophycus M.J. Wynne (Bacillariophyta) from China, all possessing apical pore fields","authors":"Bing Liu, YANG-YAN Zhou, S. Blanco, David M. Williams","doi":"10.5507/fot.2021.020","DOIUrl":"https://doi.org/10.5507/fot.2021.020","url":null,"abstract":"Delicatophycus wulingensis sp. nov., D. qinghainensis sp. nov., and D. menyuanensis sp. nov., are described, illustrated, and compared to similar taxa. Two types of apical pore fields (APFs) in the genus Cymbella are defined. The three new Delicatophycus all possess the type II APF found in some species of Cymbella, i.e. the APF is divided by the distal raphe fissure into two areas, one larger than the other. They also share a further three distinct features: variable central dorsal portion of valve, stigmata, and a notch on the dorsal side of the distal raphe fissure. Since there are many species of Delicatophycus without APFs, such as D. sinensis M.J. Wynne, D. williamsii M.J. Wynne and D. chongqingensis M.J. Wynne; D. williamsii and D. liuweii Li both possess stigmata, thus proposed diagnostic characters for Delicatophycus are the tilde–shaped areolae and the dorsally curved distal fissures.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46927466","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}
I. Stanković, M. G. Udovič, M. Šušnjara, A. Alegro, Z. Levkov
: Mires are specific freshwater habitats with great importance for global biodiversity. The present study investigated diatoms in different habitats of a Đon Močvar mire and their relationship with environmental param -eters, as well as the use of diatom indicator values and the German Red List for conservation purposes. The study was conducted monthly from January to November 2012. Diatoms were sampled simultaneously with water for physical and chemical properties in three different habitats. A total of 50 diatom taxa were identified. Based on their relative abundance and diversity, habitat–related environmental factors shaped the diatom community when seasonal dynamics were less important. Multivariate analysis showed that chemical oxygen demand (COD) and conductivity were the most significant environmental variables describing diatom communities. The indicator values characterized the diatoms as a typical mire community and proved to be a reliable starting point for future monitoring and management. Diatom classification by German Red List revealed a dominance of species with priority for conservation, suggesting that the Đon Močvar should have conservation status. This study brings a better understanding of the response of diatoms to living in specific habitats and the basis for future studies on ecological characteristics of new or rare taxa. Detrended Correspondence Analysis (DCA) was used to identify and measure the relationships between diatoms and environmental variables. Analysis was conducted in Canoco 5 (ter Braak & Šmilauer 2012) on log transformed and centred relative abundance of diatom taxa and normalised environmental variables. Environmental variables that were autocorrelated were excluded from the analysis. Three sam pling sites were coded as dummy variables to represent any differences between three different sampling sites that were not captured by the environmental variables. Results are presented as a triplot in which diatom taxa, samples, and environmental variables are plotted together.
{"title":"Diversity and ecology of benthic diatoms in a mire with narrow pH gradient","authors":"I. Stanković, M. G. Udovič, M. Šušnjara, A. Alegro, Z. Levkov","doi":"10.5507/fot.2021.015","DOIUrl":"https://doi.org/10.5507/fot.2021.015","url":null,"abstract":": Mires are specific freshwater habitats with great importance for global biodiversity. The present study investigated diatoms in different habitats of a Đon Močvar mire and their relationship with environmental param -eters, as well as the use of diatom indicator values and the German Red List for conservation purposes. The study was conducted monthly from January to November 2012. Diatoms were sampled simultaneously with water for physical and chemical properties in three different habitats. A total of 50 diatom taxa were identified. Based on their relative abundance and diversity, habitat–related environmental factors shaped the diatom community when seasonal dynamics were less important. Multivariate analysis showed that chemical oxygen demand (COD) and conductivity were the most significant environmental variables describing diatom communities. The indicator values characterized the diatoms as a typical mire community and proved to be a reliable starting point for future monitoring and management. Diatom classification by German Red List revealed a dominance of species with priority for conservation, suggesting that the Đon Močvar should have conservation status. This study brings a better understanding of the response of diatoms to living in specific habitats and the basis for future studies on ecological characteristics of new or rare taxa. Detrended Correspondence Analysis (DCA) was used to identify and measure the relationships between diatoms and environmental variables. Analysis was conducted in Canoco 5 (ter Braak & Šmilauer 2012) on log transformed and centred relative abundance of diatom taxa and normalised environmental variables. Environmental variables that were autocorrelated were excluded from the analysis. Three sam pling sites were coded as dummy variables to represent any differences between three different sampling sites that were not captured by the environmental variables. Results are presented as a triplot in which diatom taxa, samples, and environmental variables are plotted together.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45528905","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":"A new species of Trachelomonas (Euglenaceae, Euglenophyceae) from China","authors":"Xiao-Die Jiang, X. Chen, W. Pang, Quan Wang","doi":"10.5507/fot.2021.014","DOIUrl":"https://doi.org/10.5507/fot.2021.014","url":null,"abstract":"","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47516603","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}
R. Romanov, S. Barinova, V. Nikulin, A. Gontcharov
: A new species, Chara lipkinii , was described based on specimens from the Mediterranean, Israel. Dioecy, 10–13 branchlets in a whorl, complete tylacanthous to isostichous displostichous axial cortex with very short solitary spine cells, hardly visible diplostephanous bistipulate short obtuse stipulodes, frequently appearing as haplostephanous, in combination with completely ecorticate branchlets without cortex initials and with 1–3, mainly two nodes with unilateral bract cells distinguish it from species of Chara described to date. Its morphological traits, which are most important in the infrageneric taxonomy described by Wood, point towards its placement in the subsection Chara , rather than its distant clustering with both Chara and Grovesia . The oospore surface of C. lipkinii showed no features allowing identification based on oospore morphology only, but could be useful to distinguish it from some species. According to our analyses, the genetic affinity of species based on rbcL and ITS1 mostly does not support infrageneric division of the genus Chara based on morphological traits. is a freshwater and brackish water species, growing in small shallow inland water bodies and streams in the Eastern Mediterranean, i.e., in one of the most threatened water bodies of the region. The species faces a very high risk of extinction in the wild. It has disappeared from all previously discovered localities, which no longer support charophyte populations. The gradual decline and disappearance of living plants from one recently discovered locality of C. lipkinii were observed as a result of heavy sediment accumulation and eutrophication. Urgent action to restore the habitat needs to be taken. of 30000 and the rbc and ITS1 Convergence of the two chains was assessed, stationarity determined according to the (the first 25% of samples were discarded as “burn–in”), and the posterior probabilities were calculated from the trees sampled during the stationary phase. The robustness of the trees was estimated by bootstrap percentages (BP; S tamatakis et al. 2008) in ML and posterior probabilities (PP) in BI. BP < 50% and PP < 0.95 were not considered. ML–based bootstrap analysis was inferred using the web service RAxML version 7.7.1 (http://embnet.vitalit.ch/ raxml–bb/; Kozlov
{"title":"Chara lipkinii (Charales, Charophyceae): a new dioecious Mediterranean species under risk of extinction in the wild and some implications for the taxonomy of the genus Chara","authors":"R. Romanov, S. Barinova, V. Nikulin, A. Gontcharov","doi":"10.5507/fot.2021.012","DOIUrl":"https://doi.org/10.5507/fot.2021.012","url":null,"abstract":": A new species, Chara lipkinii , was described based on specimens from the Mediterranean, Israel. Dioecy, 10–13 branchlets in a whorl, complete tylacanthous to isostichous displostichous axial cortex with very short solitary spine cells, hardly visible diplostephanous bistipulate short obtuse stipulodes, frequently appearing as haplostephanous, in combination with completely ecorticate branchlets without cortex initials and with 1–3, mainly two nodes with unilateral bract cells distinguish it from species of Chara described to date. Its morphological traits, which are most important in the infrageneric taxonomy described by Wood, point towards its placement in the subsection Chara , rather than its distant clustering with both Chara and Grovesia . The oospore surface of C. lipkinii showed no features allowing identification based on oospore morphology only, but could be useful to distinguish it from some species. According to our analyses, the genetic affinity of species based on rbcL and ITS1 mostly does not support infrageneric division of the genus Chara based on morphological traits. is a freshwater and brackish water species, growing in small shallow inland water bodies and streams in the Eastern Mediterranean, i.e., in one of the most threatened water bodies of the region. The species faces a very high risk of extinction in the wild. It has disappeared from all previously discovered localities, which no longer support charophyte populations. The gradual decline and disappearance of living plants from one recently discovered locality of C. lipkinii were observed as a result of heavy sediment accumulation and eutrophication. Urgent action to restore the habitat needs to be taken. of 30000 and the rbc and ITS1 Convergence of the two chains was assessed, stationarity determined according to the (the first 25% of samples were discarded as “burn–in”), and the posterior probabilities were calculated from the trees sampled during the stationary phase. The robustness of the trees was estimated by bootstrap percentages (BP; S tamatakis et al. 2008) in ML and posterior probabilities (PP) in BI. BP < 50% and PP < 0.95 were not considered. ML–based bootstrap analysis was inferred using the web service RAxML version 7.7.1 (http://embnet.vitalit.ch/ raxml–bb/; Kozlov","PeriodicalId":55149,"journal":{"name":"Fottea","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42887861","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}
S. Hamsher, J. Kociolek, S. Spaulding, Amal I. Saleh
Light and scanning electron microscope observations are made on some members of the section Obtusae in the genus Nitzschia (Bacillariales, Bacillariophyceae). We use type and other material derived from both the National Water Quality Assessment (NAWQA) program in the USA and from Egypt to assess five different taxa, two of which are described as new to science (Nitzschia lowei, sp. nov., Nitzschia potapovae, sp. nov.) and another is made as a new nomenclatural combination (Nitzschia kurzeana var. multistriata (Hohn) comb. nov.). Other names used in the literature for some of these taxa are considered and discussed. Based on the features of sigmoid valves, eccentric raphe not in an elevated keel, lack of a conopeum, strongly bent, elongated external proximal raphe ends extending onto the valve face, and presence of a differentiated central ‘nodule’, members of this group are clearly differentiated from the generitype of Nitzschia and most other recognized sections of the genus.
{"title":"Taxonomy and nomenclature of some members within the Obtusae section of Nitzschia Hassall (Bacillariophyceae) including descriptions of two new species","authors":"S. Hamsher, J. Kociolek, S. Spaulding, Amal I. Saleh","doi":"10.5507/fot.2021.010","DOIUrl":"https://doi.org/10.5507/fot.2021.010","url":null,"abstract":"Light and scanning electron microscope observations are made on some members of the section Obtusae in the genus Nitzschia (Bacillariales, Bacillariophyceae). We use type and other material derived from both the National Water Quality Assessment (NAWQA) program in the USA and from Egypt to assess five different taxa, two of which are described as new to science (Nitzschia lowei, sp. nov., Nitzschia potapovae, sp. nov.) and another is made as a new nomenclatural combination (Nitzschia kurzeana var. multistriata (Hohn) comb. nov.). Other names used in the literature for some of these taxa are considered and discussed. Based on the features of sigmoid valves, eccentric raphe not in an elevated keel, lack of a conopeum, strongly bent, elongated external proximal raphe ends extending onto the valve face, and presence of a differentiated central ‘nodule’, members of this group are clearly differentiated from the generitype of Nitzschia and most other recognized sections of the genus.","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":"47977681","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}
A new species of heterocytous cyanobacterium Dulcicalothrix alborzica sp. nov. (Calotrichaceae) was isolated from Iran and described following a polyphasic approach. Morphological examination indicated that the strain, initially called “Alborzica”, belonged to the genus Calothrix. Nonetheless, 16S rRNA gene analysis showed that “Alborzica” were within the Dulcicalothrix cluster. In order to confirm the taxonomic position of this new taxon, rbcL and rpoC1 phylogenies were inferred. Results confirmed identity of “Alborzica” supporting the 16S rRNA phylogeny. Analysis of the secondary structures of 16S–23S Internal Transcribed Spacer (ITS) revealed that “Alborzica” had unique structure compared with known Dulcicalothrix spp. Therefore, based on the morphology and thorough molecular analysis, “Alborzica’’ should be considered a novel species in the genus Dulcicalothrix.
{"title":"Multiple phylogenies reveal a true taxonomic position of Dulcicalothrix alborzica sp. nov. (Nostocales, Cyanobacteria)","authors":"B. Nowruzi, S. Shalygin","doi":"10.5507/fot.2021.008","DOIUrl":"https://doi.org/10.5507/fot.2021.008","url":null,"abstract":"A new species of heterocytous cyanobacterium Dulcicalothrix alborzica sp. nov. (Calotrichaceae) was isolated from Iran and described following a polyphasic approach. Morphological examination indicated that the strain, initially called “Alborzica”, belonged to the genus Calothrix. Nonetheless, 16S rRNA gene analysis showed that “Alborzica” were within the Dulcicalothrix cluster. In order to confirm the taxonomic position of this new taxon, rbcL and rpoC1 phylogenies were inferred. Results confirmed identity of “Alborzica” supporting the 16S rRNA phylogeny. Analysis of the secondary structures of 16S–23S Internal Transcribed Spacer (ITS) revealed that “Alborzica” had unique structure compared with known Dulcicalothrix spp. Therefore, based on the morphology and thorough molecular analysis, “Alborzica’’ should be considered a novel species in the genus Dulcicalothrix.","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":"47422003","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}
Three new species of the genus Stauroneis Ehrenberg are discovered from the Northern Western Ghats of India – Stauroneis datarii sp. nov., Stauroneis bahlsii sp. nov., and Stauroneis hamiltonii sp. nov. Based on light microscopy (LM) and scanning electron microscopy (SEM) observations, detailed morphological features are presented and each taxon is discussed in comparison with similar species within the genus. Features of linear–lanceolate valves with median constriction, rounded apices, bow–tie shaped stauros, and radiating striae characterize Stauroneis datarii. Stauroneis bahlsii has large, lanceolate valves, with obtusely–rounded apices, a bow–tie shaped stauros that may have isolated areolae in some valves. Stauroneis hamiltonii possesses linear–lanceolate valves, broadly rostrate apices, characteristic bow–tie shaped stauros, and radiate striae. All of the taxa share a characteristic pseudoseptum at the apices. The recent discoveries of many novel taxa from the terrestrial and semi–aquatic environments of the Northern Western Ghats highlight the role of non–aquatic habitats in unmasking the diatom diversity of the Indian subcontinent.
{"title":"Three new species of the genus Stauroneis Ehrenberg (Bacillariophyceae: Stauroneidaceae) from the Northern Western Ghats, India","authors":"Neha Wadmare, J. Kociolek, B. Karthick","doi":"10.5507/fot.2021.007","DOIUrl":"https://doi.org/10.5507/fot.2021.007","url":null,"abstract":"Three new species of the genus Stauroneis Ehrenberg are discovered from the Northern Western Ghats of India – Stauroneis datarii sp. nov., Stauroneis bahlsii sp. nov., and Stauroneis hamiltonii sp. nov. Based on light microscopy (LM) and scanning electron microscopy (SEM) observations, detailed morphological features are presented and each taxon is discussed in comparison with similar species within the genus. Features of linear–lanceolate valves with median constriction, rounded apices, bow–tie shaped stauros, and radiating striae characterize Stauroneis datarii. Stauroneis bahlsii has large, lanceolate valves, with obtusely–rounded apices, a bow–tie shaped stauros that may have isolated areolae in some valves. Stauroneis hamiltonii possesses linear–lanceolate valves, broadly rostrate apices, characteristic bow–tie shaped stauros, and radiate striae. All of the taxa share a characteristic pseudoseptum at the apices. The recent discoveries of many novel taxa from the terrestrial and semi–aquatic environments of the Northern Western Ghats highlight the role of non–aquatic habitats in unmasking the diatom diversity of the Indian subcontinent.","PeriodicalId":55149,"journal":{"name":"Fottea","volume":"1 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42434896","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}
David Heudre, C. E. Wetzel, H. LANGE-BERTALOT, B. Van de Vijver, Laura Moreau, L. Ector
The diatom genus Tabellaria Ehrenberg is one of the most widely distributed genera in freshwaters, both in benthos and phytoplankton. It is rather frequent in unpolluted, circumneutral to slightly acidic and poorly mineralized lakes, streams and peat bogs. Despite being studied intensively in the last decades, the taxonomy of this genus is still unsatisfactory as some authors recently proposed to consider most species as synonyms of Tabellaria flocculosa (Roth) Kützing. Several dozen of Tabellaria rich samples from Europe were investigated and six were selected to illustrate typical populations. Five new species are described based on detailed LM and SEM observations: Tabellaria acidodelicata sp. nov., Tabellaria hercynica sp. nov., Tabellaria koppeniana sp. nov., Tabellaria procera sp. nov. and Tabellaria valdeventricosa sp. nov. Additionally, the type materials of T. fenestrata, T. flocculosa and T. ventricosa have been investigated and illustrated together with a discussion on Tabellaria andina stat. nov., at present exclusively found in South America.
{"title":"A review of Tabellaria species from freshwater environments in Europe","authors":"David Heudre, C. E. Wetzel, H. LANGE-BERTALOT, B. Van de Vijver, Laura Moreau, L. Ector","doi":"10.5507/fot.2021.005","DOIUrl":"https://doi.org/10.5507/fot.2021.005","url":null,"abstract":"The diatom genus Tabellaria Ehrenberg is one of the most widely distributed genera in freshwaters, both in benthos and phytoplankton. It is rather frequent in unpolluted, circumneutral to slightly acidic and poorly mineralized lakes, streams and peat bogs. Despite being studied intensively in the last decades, the taxonomy of this genus is still unsatisfactory as some authors recently proposed to consider most species as synonyms of Tabellaria flocculosa (Roth) Kützing. Several dozen of Tabellaria rich samples from Europe were investigated and six were selected to illustrate typical populations. Five new species are described based on detailed LM and SEM observations: Tabellaria acidodelicata sp. nov., Tabellaria hercynica sp. nov., Tabellaria koppeniana sp. nov., Tabellaria procera sp. nov. and Tabellaria valdeventricosa sp. nov. Additionally, the type materials of T. fenestrata, T. flocculosa and T. ventricosa have been investigated and illustrated together with a discussion on Tabellaria andina stat. nov., at present exclusively found in South America.","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":"43290322","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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