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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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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 multiformis was collected in freshwater ponds near Konstanz, Germany. Stentor multiformis is blue-ish. The pigment granules are arranged in longitudinal stripes in the cortex. Depending on the habitat the colour can be more or less intense or greenish blue. The macronucleus of this species is spherical. Bright field.
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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 multiformis was collected in freshwater ponds near Konstanz, Germany. Stentor multiformis is blue-ish. The pigment granules are arranged in longitudinal stripes in the cortex. Depending on the habitat the colour can be more or less intense or greenish blue. The macronucleus of this species is spherical. Focal plane on the spherical macronucleus is the bright regiuon in the middle of the cell form.
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Originally described by Ehrenberg under the name Stentor niger. However, the presence of green endosymbionts excludes it from that species, as currently described. Kahl suggests that Ehrenberg has mixed S. niger with S. multiformis (Alfred Kahl, Wimpertiere oder Ciliata, 3. Spirotricha, 1932, p. 465).
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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 niger was collected in a moor located in the Salzburger Land, Austria. : Stentor niger can be pigmented brownish or yellowish. Stentor niger has no symbiontic algae. The macronucleus is spherical. This specimen has a transparent lorica of secreted mucus, only made visible by the attached bacteria. Differential interference contrast.
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Stentor (sten-torr), two species shown here, the larger green (it contains symbiotic green algae) is Stentor polymorphus. Stentors are heterotrich ciliates with a well developed adoral zone extending around the margins of the broad oral region of the body. The cells are pliable and contractile. Phase contrast.
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Stentor (sten-torr), two species shown here, the larger green (it contains symbiotic green algae) is Stentor polymorphus. Stentors are heterotrich ciliates with a well developed adoral zone extending around the margins of the broad oral region of the body. The cells are pliable and contractile - the two images here show the same cell - the one to the left is extended, the one to the right is contracted. Phase contrast.
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Stentor (sten-torr) polymorphus. Stentors are heterotrich ciliates with a well developed adoral zone extending around the margins of the broad oral region of the body. The cells are pliable and contractile. This species is green because the cell contains many symbiotic green algae. Phase 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 specimen of Stentor polymorphus was collected in freshwater ponds near Konstanz, Germany. Stentor polymorphus can be easily distinguished from other species of Stentor by its symbiotic algae and the colourless cortical granules. The macronucleus is like a string of pearls. Differential interference contrast.
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Stentor polymorphus.