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Detail of long forked radiating siliceous spine of Acanthocystis turfacea (Carter,1863), demonstrating the typical circular baseplate. From standing fresh water near Boise, Idaho.DIC.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Detail of radiating forked siliceous spines of Acanthocystis turfacea (Carter,1863) which have detached from the periplast under the pressure of the coverglass. A. turfacea is a centroheliozoon with tangentially layered siliceous scales and two types of forked radial siliceous spines, one short, the other long (both seen here). The radiating axopodia contain extrusomes (not seen in this image). Endosymbiotic zoochlorellae are visible in this image. From standing fresh water near Boise, Idaho.DIC.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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This species has spines of two lengths and that fork at their extremity. It also frequently occurs, as in this case, with symbiotic green algae. Phase contrast micrograph.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Scale bar indicates 50 µm.Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
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Phaeocystis (fay-owe-sis-tiss), an unusual haptophyte (prymnesiophyte) in which cells form spherical gelatinous colonies, and may cause problems with fish respiration. This medium-sized colony may be of P. globosa. Dark ground illumination.
data on this strain.
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Portrait of centrohelid heliozoan with thick wavy gelatinous mantle incorporating scales. Probably from a genus in the Raphidiophryidae Mikrjukov, 1996, probably Raphidiophrys. This species contains zoochlorellae. From stagnant freshwater pool near Boise, Idaho. I would like to thank Vasilij Zlatogursky of St. Petersburg University for his assistance in identifying this specimen. Brightfield..
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Phaeocystis (fay-owe-sis-tiss), an unusual haptophyte (prymnesiophyte) in which cells form spherical gelatinous colonies, and may cause problems with fish respiration. This is a small element of a large colony .
data on this strain.
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Portrait of centrohelid heliozoan with thick wavy gelatinous mantle incorporating scales. Probably from a genus in the Raphidiophryidae Mikrjukov, 1996. This species contains zoochlorellae. From stagnant freshwater pool near Boise, Idaho. Phase contrast. I would like to thank Vasilij Zlatogursky of St. Petersburg University for his assistance in identifying this specimen.
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Phaeocystis (fay-owe-sis-tiss), an unusual haptophyte (prymnesiophyte) in which cells form spherical gelatinous colonies, and may cause problems with fish respiration. This small colony is probably P. globosa.
data on this strain.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Phase contrast.
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Phaeocystis (fay-owe-sis-tiss), an unusual haptophyte (prymnesiophyte) in which cells form spherical gelatinous colonies, and may cause problems with fish respiration. Detail, probably P. globosa. Differential interference microscopy.
data on this strain.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. The arms are supported by microtubular axonemes which terminate on a central granule (centroplast) which can just about be seen here. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Differential interference contrast.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins - a good example of which is seen upper left. Phase contrast.
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This image was made from samples taken during a scientific cruise in the Pacific. Water was filtered to concentrate the organisms that were present, then dried onto a thin sheet of plastic and then shadowed with a fine layer of metal to provide contrast. The preparation was then observed with an electron-microscope. This technique has been used to document the diversity of marine microbes, especially, protists in the oceans. These may be hoop coccliths from Ceratolithus.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Phase contrast.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Phase contrast.
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Raphidiophrys (rah-fid-ee-off-riss) is a centrohelid heliozoon. Like other centrohelids, it has thin untapering arms, which have prominent extrusomes. Distinguished from other genera because the cell is enclosed in a layer of loosely adhering boat-shaped scales with thickened margins. Phase contrast.
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Portrait of Raphidiophrys, a centroheliozoon with siliceous scales but no radiating spicules. Axopodia bearing extrusomes are evident. The abundant scales obscure the details of the cell body in this image. Sometimes multiple individuals cluster. From fresh water pond near Boise, Idaho. Phase contrast.
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Detail of siliceous tangential scales of Raphidiophrys showing characteristic "canoe" shape. From freshwater pond near Boise, Idaho. Oblique illumination.