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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, frequently attached with the posterior end to vegetation or other surfaces. Detached individuals swim freely and adopt an oval to pyriform shape. There is a well-developed peristomial field with a system of adoral membranelles (AZM) at the anterior end, and the AZM spirals clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate, a long thread, or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species of the genus build transparent lorica of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). Stentor amethystinus can be coloured brownish, violet or purple red. The cell has symbiotic algae. This specimen was collected in freshwater ponds near Konstanz, Germany. Differential interference contrast.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, frequently attached with the posterior end to vegetation or other surfaces. Detached individuals swim freely and adopt an oval to pyriform shape. There is a well-developed peristomial field with a system of adoral membranelles (AZM) at the anterior end, and the AZM spirals clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate, a long thread, or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species of the genus build transparent lorica of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). Stentor amethystinus can be coloured brownish, violet or purple red. The cell has symbiotic algae. The violet pigment granules are arranged in longitudinal stripes. This specimen was collected in freshwater ponds near Konstanz, Germany. Differential interference contrast.
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Stentor (sten-torr) is a genus of large, trumpet-shaped ciliates, commonly found in freshwater ponds, frequently attached with the posterior end to vegetation or other surfaces. Detached individuals swim freely and adopt an oval to pyriform shape. There is a well-developed peristomial field with a system of adoral membranelles (AZM) at the anteriuor end, and the AZM spirals clockwise to the cytostome. The cilia of the membranelles are much longer than the somatic cilia. The macronuclei of Stentor may be spherical, elongate, a long thread, or formed like a string of pearls. There is a single contractile vacuole with two collecting canals near the cytostome. Some species of the genus build transparent lorica of secreted mucus. The cells can be intensive coloured by pigmentation granules located in the pellicula (green, pink, blue, orange or violet). Stentor amethystinus can be coloured brownish, violet or purple red. The cell has symbiotic algae. The spherical macronucleus of Stentor amethystinus is surrounded by many micronuclei, each covered with a coating of violet pigment granules. This specimen was collected in freshwater ponds near Konstanz, Germany. 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. This image shows the pigment granules among kineties in the oral region. 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. This image shows the pigment granules in the cortex. 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. 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.