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132 results for “Freshwater diatoms”
FIGURES 36–41 in Actinellopsis murphyi gen. et spec. nov.: A new small celled freshwater diatom (Bacillariophyta, Eunotiales) from Zambia
FIGURES 36–41. SEM images of valve interior of Actinellopsis murphyi gen. et. spec. nov. Figs 36–38. SEM images showing the internal valve view. Figs 39–41 SEM images of internal pole showing rimoportulae, helictoglossa and internal areolar openings. Scale bar = 10 µm (37), 5 µm (36, 38), 2 µm (40, 41), 1 µm (39).
FIGURES 26–35 in Actinellopsis murphyi gen. et spec. nov.: A new small celled freshwater diatom (Bacillariophyta, Eunotiales) from Zambia
FIGURES 26–35. SEM images of external head and foot poles of Actinellopsis murphyi gen. et. spec. nov. Figs 26–30. SEM images of external view of head pole. Figs 31–35. SEM images of external view of foot pole. Rimoportula opening (R). Scale bar = 3 µm (26, 27), 2 µm (28, 29, 30, 31, 32, 33, 34, 35).
FIGURES 2–22 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURES 2–22. Aulacoseira veraluciae, LM. Scale: 10 µm. Figs 2, 3. Initial cells. Figs 4, 5. Valve view of the separation cells. Figs 6, 7. Valve view of the linking cells. Fig. 8. View of the cell lumen showing the ringleiste. Figs 9‒22. Aspect of the chains.
FIGURE 1 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURE 1. Location of the sampling sites of Aulacoseira veraluciae on different Brazilian geographic regions.
FIGURES 30–35 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURES 30–35. Aulacoseira veraluciae, SEM. Scales: 2 µm (Figs 30, 31, 34), 1 µm (Figs 32, 33, 35). Figs 30, 31. External rimoportulae openings (arrows) in the separation and linking valves, respectively. Fig. 32. Internal rimoportula opening (arrow) near the valve face/ mantle junction in the separation valve. Fig. 33. Internal rimoportulae openings (arrows) on the ringleist. Fig. 34. Detail of ringleiste. Fig. 35. Aspect of the girdle bands. Note the fimbriate valvocopula (arrow).
FIGURES 23–29 in Aulacoseira veraluciae sp. nov. (Coscinodiscophyceae, Aulacoseiraceae): a common freshwater diatom from Brazil
FIGURES 23–29. Aulacoseira veraluciae, SEM, external view. Scales: 5 µm (Figs 23, 29), 2 µm (Figs 24‒28). Fig. 23. Overview of the valve showing the separation spines. Fig. 24. Valve face of the separation cell. Fig. 25. Valve face of the linking cell. Figs 26, 27. Detail of the linking spines. Fig. 28. Detail of the mantle areolae occluded by velum. Fig. 29. Mantle of the linking valves and location of external rimoportulae openings (arrows).
FIGURES 16–21 in Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China
FIGURES 16–21. Encyonema chebalingense sp. nov. SEM images from type material, internal views. 16. Entire valve view. 17–21. Apex of valve with distal raphe ending terminating as a helictoglossa. Fig. 18. Valve center showing central nodule with proximal ends of the raphe hidden by siliceous covering. Figs 19–21. Distal raphe end showing helictoglossa. Scale bars = 1 μm (19–21), 2 μm (Fig.17–21): 2.5 μm (16).
FIGURES 10–15 in Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China
FIGURES 10–15. Encyonema chebalingense sp. nov. SEM images from type material. External views. 10–11. Valve in external view. 12–13. Apex of valve showing proximal raphe endings. 14. External view of the valve center. Note the distal raphe endings ae hooked towards the ventral margin. 15. Distal raphe ending at valve apex. Scale bars = 1 μm (12), 1.5 μm (15), 2 μm (13, 14), 2.5 μm (11), 5 μm (10).
FIGURES 1–9 in Encyonema chebalingense sp. nov., a new freshwater diatom species (Cymbellales, Bacillariophyceae) from Guangdong Province, China
FIGURES 1–9. Encyonema chebalingense sp. nov. LM. Size diminution series of individuals from the holotype slide. Valve views. Scale bar =10 μm
FIGURES 2–38 in Staurosirella paranaensis sp. nov., a new epiphytic freshwater diatom (Bacillariophyceae) from the Paraná River floodplain, Brazil, South America
FIGURES 2–38. LM. Staurosirella paranaensis sp. nov. from type material. 2–34. LM. 2–9, 13–34. Valve view. 10–12. Girdle view. 35– 38. SEM–External view. Valve views depicting characteristics of the central narrow sternum, striae, and apical pore fields. Vimines long and narrow becoming shorter toward the sternum. Striae running uninterrupted from valve face to mantle, with areolae slit-like. 36–37. Apical pore fields. Broken spines suggesting initially hollow then becoming a solid structure. LM scale bar 10 μm, in SEM the scale bars are identified in the images. Figure 21* indicates the holotype specimen.
FIGURES 39–44 in Staurosirella paranaensis sp. nov., a new epiphytic freshwater diatom (Bacillariophyceae) from the Paraná River floodplain, Brazil, South America
FIGURES 39–44. SEM. Staurosirella paranaensis sp. nov. from type material. 39–41. Girdle view of a complete frustule showing wider valvocopulae still attached to both valves. 42. Union of two valves by spines and formation of colonies. 43. Spines detail showing solid spines and an apically elongated structure with a lamina that becomes spatulate with two prominences in shape at the top. 44. View of the spine's junction of copula, spines terminating near or over the neighboring valve areolae. Scale bars are identified in the SEM images.
Dataset from: Resolving marine–freshwater transitions by diatoms through a fog of gene tree discordance
<p>This repository contains the datasets, code, and results for:</p> <p>Roberts et al. Resolving marine-freshwater transitions by diatoms through a fog of gene tree discordance.</p> <p>CONTACT INFORMATION:</p> <p>Andrew J. Alverson<br> University of Arkansas<br> aja [at] uark [dot] edu</p> <p>Wade R. Roberts<br> University of Arkansas<br> wader [at] uark [dot] edu</p> <p>TAXON LABEL INFORMATION:</p> <p>Genomes have strain ID before genus_species (e.g., CCMP332_Cyclotella_cryptica)<br> Transcriptomes have genus_species before strain ID (e.g., Cyclotella_nana_AJA048-54)</p> <p><br> DATA AND DIRECTORY OVERVIEW:</p> <p>Voucher images of diatom strains collected:</p> <ul> <li>voucher-images.tgz</li> </ul> <p>OrthoFinder output:</p> <ul> <li>orthofinder.zip</li> </ul> <p>Predicted proteomes and coding sequences for each strain:</p> <ul> <li>proteomes.zip</li> <li>coding-sequences.zip</li> </ul> <p>Workflow for phylogenomic dataset assembly and species tree analyses:</p> <ul> <li>phylogenomic-workflow.html</li> <li>phylogenomic-workflow.md</li> <li>phylogenomic-workflow.pdf</li> </ul> <p>Fasta files, alignments, and gene trees for each ortholog:</p> <ul> <li>datasets.zip</li> </ul> <p>Concatenated alignments, partition models, and estimated species trees:</p> <ul> <li>species-trees.zip</li> <li>species-trees.nexus</li> </ul> <p>Analyses results and code to plot figures:</p> <ul> <li>analyses-and-plots.zip</li> </ul> <p>Additional scripts and miscellaneous files:</p> <ul> <li>scripts-and-misc.zip</li> </ul> <p>Supplemental Materials for publication:</p> <ul> <li>supplemental-materials.zip</li> </ul> <p> </p>
Data from: Hidden diversity in the freshwater planktonic diatom Asterionella formosa
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Data from: The model marine diatom Thalassiosira pseudonana likely descended from a freshwater ancestor in the genus Cyclotella
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Data from: Diatoms do radiate: evidence for a freshwater species flock
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Data from: Genotypic diversity and differentiation among populations of two benthic freshwater diatoms as revealed by microsatellites
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Diatoms define a novel freshwater biogeography of the Antarctic
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Figure 2 from: Cocquyt C, Lokele Ndjombo E, Tutu Tsamemba S, Nshimba Seya wa Malale H (2019) Freshwater diatoms in the Democratic Republic of the Congo: a historical overview of the research and publications. PhytoKeys 136: 107-125. https://doi.org/10.3897/phytokeys.136.47386
Figure 2 Pie diagram showing the relative abundance of the 21 genera (s.l.) to which the newly described species and infraspecific taxa from the DR Congo belong, Nitzschia being the most important, followed by Pinnularia and Navicula s.l.
Data from: Timing marine-freshwater transitions in the diatom order Thalassiosirales
With species found throughout both marine and fresh waters, the diatom order Thalassiosirales is one of the most phylogenetically and ecologically diverse lineages of planktonic diatoms. A clear understanding of the timescale of Thalassiosirales evolution would provide novel insights into the rates and patterns of species diversification associated with major habitat shifts, as well as provide valuable context for understanding the age and evolutionary history of the model species, Cyclotella nana (= Thalassiosira pseudonana). The freshwater fossil record for Thalassiosirales is extensive, well characterized, and generally supportive of a Miocene origin for the major freshwater lineages. The marine record is, by comparison, more sparse and in many cases, unverified. The discovery of freshwater thalassiosiroids in Eocene sediments pushed the freshwater fossil record considerably further back in time, highlighting an apparent gap of some 30 million years. An alternative interpretation is that the Miocene and Eocene reports represent competing hypotheses. In the absence of additional independent and decisive fossil data, I explored the relative plausibility of these two scenarios with Bayesian relaxed molecular clock methods under a range of fossil calibration schemes. Although I found no support for the Eocene fossil dates, the two major freshwater colonization events probably occurred much earlier than previously thought—as early as the Paleocene for Cyclotella, followed by an Eocene origin for the cyclostephanoid lineage. Much of the extant freshwater diversity in both lineages traces back to the Miocene, however, giving the impression of a single Miocene origin. Efforts to infer the timescale of Thalassiosirales evolution more accurately would benefit from a systematic reevaluation of the marine fossil record and formal integration of fossil species into existing phylogenetic hypotheses.
FIGURE 1 in Staurosirella paranaensis sp. nov., a new epiphytic freshwater diatom (Bacillariophyceae) from the Paraná River floodplain, Brazil, South America
FIGURE 1. Map of the location of Garças Lagoon in the Upper Paraná River floodplain, Brazil.
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Allen Brain Atlas
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International Brain Laboratory public data
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