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Coscinodiscus (a centric diatom), seen from valve view. This is an empty frustule of a large marine species. The pattern of pores in the frustule is used in identification. Marine. Differential interference contrast.
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SEM of girdle view. The ligulae which fit in the open girdle bands are weakly visible. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
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Coscinodiscus (caw-skin-owe-disk-us) a centric diatom (stramenopile), this genus is common in the marine plankton and has hundreds of species, some of which can achieve a very large size. The cell to the left is in girdle view, with the two valves visible to either end and girdle bands in the middle of the cell, the cell to the right is seen from valve (end) view. This genus has small thickenings (processes) around the margin of the valve. The species are mostly distinguished by the pattern of sculpting of the frustule. Differential interference microscopy.
data on this strain.
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Closeup of the lateral side of the valve. Scale bar indicates 25 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
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Cells of this centric diatom observed in the water column from Lake Pontchartrain, differential interference contrast optics.
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Valvar View. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
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Closeup showing hyaline central area. Scale bar indicates 10 µm. Sample from North Sea near Heligoland (spring diatom bloom). Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
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Closeup showing fine structure of valvar pores. Scale bar indicates 5 µm. Sample from North Sea near Heligoland (spring diatom bloom). Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
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This large flat centric diatom is commonly found in the waters off Martha's Vineyard. This is a phase contrast image by D J Patterson and D Lahr.
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Valvar view. Insets showing marginal ring of labiate processes (upper right) and the hyaline central area (lower left). Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking and stitching technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Ethmosdiscus, a centric diatom showing wide girdle bands around the cell. The guys may be huge (up to 1 mm in diameter). From the Sargasso Sea. Dark ground illumination, image by Dave Caron
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Closeup of the hyaline central area. Scale bar indicates 25 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking and stitching technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Closeup of the marginal ring of labiate processes. Scale bar indicates 25 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking and stitching technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Coscinodiscus wailesii. oblique SEM . Visible are: girdle bands, two regular rows of rimoportulae (2-3 areolae from margin & at valve face/mantle junction), one irregular row of rimoportulae near center, irregular hyaline central area. scale bar is 10µm.
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DIC closeup of valve of a living specimen. Scale bar indicates 50 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Valvar view, dark field. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking and stitching technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Thick walled, flat cells, which are united into tight chains, valve diameter 8-80 microns. P. sulcata is a benthic from but appears in the plankton in turbulent water
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Coscinodiscus wailesii,schematic girdle view of one theca (modified from Gran & Angst, Fig. 26)
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Coscinodiscus wailesii, cleaned valve, light microscope