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Vahlkampfia (vall-camp-fee-a) (= Schizopyrenus - skitz-owe-pyre-een-us ?) a heterolobose amoeba, pseudopodia are produced in sudden bulges, and are lobose. Cyst with irregular outer wall. Differential interference contrast.
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Pleurostomum flabellatum Ruinen, 1938. Cell 11-14 microns long, spindle-shaped and round in transverse section with two parallel flagella inserting apically. The flagella are 0.5-1.5 times body length. They are often, but not always, the same length. The flagella were usually observed stuck to the coverslip or slide. When free the flagella beat homodynamically. Subapically there is a wide and deep opening or groove that runs half to three quarters the way down the body in a half spiral and usually ends in close association with a food vacuole. The body was not observed to bend or flex except in one individual where the posterior third of the cell was stuck to the coverslip.
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Stephanopogon apogon (steff-anne-owe-poe-gone) is a marine genus of uncertain affinities and include a small handful of species. Cells are dorso-ventrally flattened, with a wide anterior mouth which may or may not have some barbs. It moves by using flagella which are laid out in longitudinal rows. For a long time erroneously considered to be a primitive ciliate (distinguished from real ciliates because it does not have macronuclei and micronuclei). This encysting cell can be seen to have several conventional nuclei with central nuceoli. Eats diatoms and detritus. Phase contrast.
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Portrait ((dorsal surface) of the colorless benthic marine protist, Stephanopogon apogon (Borror, 1965). The taxonomic position of Stephanopogon is uncertain. Once thought to be a ciliate, electron microscopic studies of S. apogon revealed absence of ciliate characteristics such as pellicular alveoli, infraciliature (e.g. kinetodesmal fibrils, postciliary microtubules and transverse microtubules) and nuclear dualism. S. apogon is elongate and moderately dorsoventrally flattened. The cell is curved slightly to the right. The posterior is round and the anterior end obliquely truncate. There are approximately 6-8 longitudinal files of smooth flagellae limited to the ventral surface. The anterior apical cytostome is slit-like and bordered by a slightly raised lip (visible here). There are 2-16 homokaryotic nuclei (not seen here).A contractile vacuole is absent. Division occurs while encysted (palintomy). Collected from a commercial saltwater aquarium in Boise, Idaho September 2004. DIC.
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Naegleria gruberi
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Altuzarra, La Rioja, Spain
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Vahlkampfia (vall-camp-fee-a) (= Schizopyrenus - skitz-owe-pyre-een-us ?) a heterolobose amoeba, pseudopodia are produced in sudden bulges, and are lobose. Large hyaline region. Also with posterior contractile vacuole, nucleus with nucleolus and various food vacuoles and inclusions. Usually with a small uroid giving rise to filaments, but this is not evident here. Phase contrast.
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Stachyamoeba (stack-ee-a-me-ba) is a free-living amoeba, usually flattended, expanded anterior margin with broad hyaline zone. With filaments arising from the uroid. At one time treated as a gruberellid and probably related to the acrasids, it can be seen to have a flagellated stage with two flagella which indicates that it is a fairly conventional heteroloboseid. Phase contrast.
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Stephanopogon apogon (steff-anne-owe-poe-gone) is a marine genus of uncertain affinities and include a small handful of species. Cells are dorso-ventrally flattened, with a wide anterior mouth which may or may not have some barbs. It moves by using flagella which are laid out in longitudinal rows. For a long time erroneously considered to be a primitive ciliate (distinguished from real ciliates because it does not have macronuclei and micronuclei). Eats diatoms and detritus. Phase contrast.
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Portrait (ventral surface) of the colorless benthic marine protist, Stephanopogon apogon (Borror, 1965). The phylogenetic affinities of Stephanopogon are uncertain. Once thought to be a ciliate, electron microscopic studies of S. apogon revealed absence of ciliate characteristics such as pellicular alveoli, infraciliature (e.g. kinetodesmal fibrils, postciliary microtubules and transverse microtubules) and nuclear dualism. S. apogon is elongate and moderately dorsoventrally flattened. The cell is curved slightly to the right. The posterior is round and the anterior end obliquely truncate. There are approximately 6-8 longitudinal rows of smooth flagella limited to the ventral surface. The anterior apical cytostome is slit-like and bordered by a slightly raised lip. There are 2-16 homokaryotic nuclei (not seen here). Division occurs while encysted (palintomy). Collected from a commercial saltwater aquarium in Boise, Idaho September 2004. DIC.
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Vahlkampfia (vall-camp-fee-a) (= Schizopyrenus - skitz-owe-pyre-een-us ?) a heterolobose amoeba, pseudopodia are produced in sudden bulges, and are lobose. Large hyaline region. Also with posterior contractile vacuole, nucleus with nucleolus and various food vacuoles and inclusions. Also showing uroidal region (lower). Differential interference contrast.
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Stachyamoeba (stack-ee-a-me-ba) is a free-living amoeba, usually flattended, expanded anterior margin with broad hyaline zone. With filaments arising from the uroid. At one time treated as a gruberellid and probably related to the acrasids, it can be seen to have a flagellated stage with two flagella which indicates that it is a fairly conventional heteroloboseid. Cysts have an irregular wall. Differential interference contrast.
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Stephanopogon apogon (steff-anne-owe-poe-gone) is a marine genus of uncertain affinities and include a small handful of species. Cells are dorso-ventrally flattened, with a wide anterior mouth which may or may not have some barbs. It moves by using flagella which are laid out in longitudinal rows. For a long time erroneously considered to be a primitive ciliate (distinguished from real ciliates because it does not have macronuclei and micronuclei). Eats diatoms and detritus. Phase contrast.
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SCanning EM showing the dorsal face of the cell with ciliary lines and the anterior mouth bordered with lips.
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Vahlkampfia (vall-camp-fee-a) (= Schizopyrenus - skitz-owe-pyre-een-us ?) a heterolobose amoeba, pseudopodia are produced in sudden bulges, and are lobose. Large hyaline regions. Also with posterior contractile vacuole, nucleus with nucleolus and various food vacuoles and inclusions. Usually with small uroids giving rise to filaments. Several cells. Phase contrast.
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Stachyamoeba (stack-ee-a-me-ba) is a free-living amoeba, usually flattended, expanded anterior margin with broad hyaline zone. With filaments arising from the uroid. At one time treated as a gruberellid and probably related to the acrasids, it can be seen to have a flagellated stage with two flagella which indicates that it is a fairly conventional heteroloboseid. Phase contrast.
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Stephanopogon apogon (steff-anne-owe-poe-gone) is a marine genus of uncertain affinities and include a small handful of species. Cells are dorso-ventrally flattened, with a wide anterior mouth which may or may not have some barbs. It moves by using flagella which are laid out in longitudinal rows. This organism was for a long time through to be a ciliate - because it looks like a ciliate. But examination of the cellular organization revealed that it s internal architecture was very different to that of ciliates - and they don t have two kinds of nuclei - like ciliates. Like many ciliates, it has flagella in rows or kineties. The anterior margin is the mouth, and the eat bacteria. Differential interference contrast.
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Cell stained by protargol showing the kineties of cilia of one face of the cell and the anterior mouth.
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Heteramoeba (het-err-a-me-ba) a naked heterolobose amoeba, distinguished from other types of naked amoebae with lobose pseudopodia largely by ultrastructural features, but trophic heterolobose amoebae tend to form their pseudopodially suddenly rather than progressively. Phase contrast.
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Scanning EM showing the ventral face of the cell with ciliary lines and the anterior mouth bordered with lips.
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Heteramoeba (het-err-a-me-ba) a naked heterolobose amoeba, distinguished from other types of naked amoebae with lobose pseudopodia largely by ultrastructural features, but trophic heterolobose amoebae tend to form their pseudopodially suddenly rather than progressively. This is a cyst. Phase contrast.
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Stephanopogon (steff-ann-owe-poe-gone) apogon Borror, 1965. Cells are about 18 - 32 microns long with several lows of kineties and dorso-ventrally flattened. The cells have a mouth located at the anterior end of a flattened neck of the cell. The cells crawl or swim with flagella. Rarely observed.