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Portrait of Acanthocystis turfacea (Carter, 1863), a centroheliozoon with tangentially layered siliceous scales and two types of forked radial siliceous spines (one short, the other long) and radiating axopodia with extrusomes, all visible in this image. Chlorella endosymbionts are present. From standing fresh water near Boise, Idaho. Brightfield.
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Portrait of Acanthocystis turfacea (Carter,1863), a centroheliozoon with tangentially layered siliceous scales and two types of forked radial siliceous spines (one short, the other long) and radiating axopodia with extrusomes, all visible in this image. Detail of radiating forked siliceous spines of Acanthocystis turfacea. . From standing fresh water near Boise, Idaho.DIC.
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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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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 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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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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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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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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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. 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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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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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.
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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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Raphidiophrys elegans can be found either grouped in colonies or as solitary living individuals. In colonies, the disc-shaped spicules form elongate cone-shaped accumulations around the pseudopodia. In solitary living individuals the spicules are arranged more tangentially. The spherical nucleus is placed eccentrically. Usually with one contractile vacuole. Symbiotic algae are sometimes present. Differential interference contrast.
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Raphidiophrys elegans can be found either grouped in colonies or as solitary living individuals. In colonies, the disc-shaped spicules form elongate cone-shaped accumulations around the pseudopodia. In solitary living individuals the spicules are arranged more tangentially. The spherical nucleus is placed eccentrically. Usually with one contractile vacuole. Symbiotic algae are sometimes present. A squashed specimen of Raphidiophrys elegans. At about 12:00 the contractile vacuole is visible and the sphaerical nucleus is at 3:00. The spicules are lie tangientially and not cone-shaped around the pseudopodia. From a bog pond near Konstanz, Germany. Differential interference contrast.
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The picture shows the charcteristic layer of mucilage armed with siliceous scales around the cell body, and the fine axopodia with numerous extrusomes. Scale bar indicates 25 µm. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Detail of long radial trumpet-shaped siliceous spines of Raphidocystis tubifera (Penard, 1904). The periplast is composed of 3 types of siliceous elements: elliptical tangential plate scales, long radial trumpet-like scales and short, broad radial funnel-shaped scales. From slow flowing organically enriched freshwater stream near Boise, Idaho. DIC.