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Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm, and endosymbiotic green algae. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216. Dark Ground illumination.
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Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm, and endosymbiotic green algae. There is a single macronucleus, usually also surrounded by pigment granules and with up to 10 or so micronuclei are pressed against the surface of the macronucleus. Tends to adopt a somewhat shortened shape when attached as is illustrated here. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216. Phase contrast micrograph.
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Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm., and endosymbiotic green algae. There is a single macronucleus, usually also surrounded by pigment granules and with up to 10 or so micronuclei are pressed against the surface of the macronucleus. Tends to adopt a somewhat shortened shape when attached. This image is of the adoral zone of membranelles (AZM) which curves around the apex of the cell and leads towards the cytostome. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216.
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Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm, and endosymbiotic green algae. There is a single macronucleus, usually also surrounded by pigment granules as can be seen here and with up to 10 or so micronuclei are pressed against the surface of the macronucleus. Tends to adopt a somewhat shortened shape when attached. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216. Differential interference contrast.
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Stentor amethystinus - a smallish brown member of the genus. The brown colour comes from a combination of dark red pigment granules which lie in rows between the kineties and may also lie within the cytoplasm., and endosymbiotic green algae. There is a single macronucleus, usually also surrounded by pigment granules and as can be seen here with up to 10 or so micronuclei are pressed against the surface of the macronucleus. Tends to adopt a somewhat shortened shape when attached. For more details on this organism and a comment about the identity, see Heep, T., Rohozinski, J., Simpson, A. and Patterson, D.J. 1998. Stentor amethuystinus (Protista: Ciliophora: Heterotrichida), a common protozoan member of the fresh-water plankton in Australia. Records Australian Museum, 50: 211-216.Differential interference contrast.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, usually attached with the posterior end to vegetation or other surfaces. Detached individuals may swim freely and adopt an oval to pyriform shape. At the anterior end of the cells a conspicuous peristomial field with a system of adoral membranelles spiralling clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate to a long strand or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species build transparent loricas of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). This group of Stentor coeruleus was collected in freshwater ponds near Konstanz, Germany. This species is couloured blueish and the macronucleus is like a string of pearls.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, usually attached with the posterior end to vegetation or other surfaces. Detached individuals may swim freely and adopt an oval to pyriform shape. At the anterior end of the cells a conspicuous peristomial field with a system of adoral membranelles spiralling clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate to a long strand or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species build transparent loricas of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). These two cells of Stentor coeruleus were collected in freshwater ponds near Konstanz, Germany. This species is couloured blueish and the macronucleus is like a string of pearls. This species has no lorica nor symbiotic algae.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, usually attached with the posterior end to vegetation or other surfaces. Detached individuals may swim freely and adopt an oval to pyriform shape. At the anterior end of the cells a conspicuous peristomial field with a system of adoral membranelles spiralling clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate to a long strand or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species build transparent loricas of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). Thise cell of Stentor coeruleus was collected in freshwater ponds near Konstanz, Germany. This species is couloured blueish caused by blue or greenish blue pigment granules arranged in longitudinal stripes in the cortex. Differential interference contrast.
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The light elliptical vacuoles arranged as a perl-necklace depict the macro nucleus of Stentor coeruleus. Collected from littoral region of a eutropic rain storage reservoir near Kiel (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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The time lapse sequence with a period length of appr. 4 seconds shows process of defecation. Frame 2 shows the opening cytoproct with intact defecation vacuole membrane. At frame 3 defecation vacuole membrane has opened to release the waste. At frame 5 and 6 we see the slowly closing cytoproct. Collected from littoral region of a eutropic rain storage reservoir near Kiel (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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A series of optical transverse sections through the vestibulum of Stentor coeruleus, the oral cavity, and the peristome. Collected from littoral region of a eutropic rain storage reservoir near Kiel (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, usually attached with the posterior end to vegetation or other surfaces. Detached individuals may swim freely and adopt an oval to pyriform shape. At the anterior end of the cells a conspicuous peristomial field with a system of adoral membranelles spiralling clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate to a long strand or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species build transparent loricas of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). This specimen of Stentor igneus was collected in freshwater ponds near Konstanz, Germany. Stentor igneus is reddish member of the genus. Depending on the habitat the colour can be more or less intensive. The macronucleus of this species is spherical.Differential interference contrast.
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Infraciliature of Stentor igneus Ehrenberg, 1838. Collected from bottom detritus of a freshwater irrigation canal. Boise, Idaho. October, 2008. Protargol A (see Foissner, W. Europ. J. Protistol., 27:313-330;1991).Brightfield.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, usually attached with the posterior end to vegetation or other surfaces. Detached individuals may swim freely and adopt an oval to pyriform shape. At the anterior end of the cells a conspicuous peristomial field with a system of adoral membranelles spiralling clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate to a long strand or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species build transparent loricas of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). This specimen of Stentor muelleri was collected in freshwater ponds near Konstanz, Germany. Stentor muelleri is a colourless species. This specimen has a transparent lorica, only visible by the attached bacteria. A conspicuous characteristic of this species is the macronucleus formed like a string of pearls.
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