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Lecythium is a shelled amoeba, with an organic shell. This phase contrast image is of the pseudopodia as they spread across the microscope slide. From a freshwater pond in Idaho.
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Rhogostoma (row-gaw-stow-ma) is a rarely reported amoeba with a flexible surrounding test and with a small opening through which pseudopodia can emerge. The opening is at the bottom of the cell and looks as if it has two lips. Large nucleus with nucleolus at the other side of the cell. Eats bacteria. Phase contrast.
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Rhogostoma (row-gaw-stow-ma) is a rarely reported amoeba with a flexible surrounding test and with a small opening through which pseudopodia can emerge. Two cells with common cytoplasm, showing the thin nature of the pseudopodia. Phase contrast.
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Rhogostoma (row-gaw-stow-ma) is a rarely reported amoeba with a flexible surrounding test and with a small opening through which pseudopodia can emerge. The opening is at the bottom of the cell and looks as if it has two lips. Folds in the test are evident. Phase contrast.
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Rhogostoma (row-gaw-stow-ma) is a rarely reported amoeba with a flexible surrounding test and with a small opening through which pseudopodia can emerge. Cluster of cells with common cytoplasm, at the centre of the cluster. With one cyst. Phase contrast.
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Rhogostoma (row-gaw-stow-ma) is a rarely reported amoeba with a flexible surrounding test and with a small opening through which pseudopodia can emerge. Cluster of cells with common cytoplasm, at the centre of the cluster. Phase contrast.
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Pseudodifflugia, a testate filose amoeba. These are small species with a chitinoid ovoid or spherical test covered with quartz particles. Difflugia are generally larger and have lobose pseudopodia. Pseudodifflugia feeds on diatoms and other algae. From freshwater koi pond near Boise, Idaho. Phase contrast.
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Cryothecomonas (cry-oh-theek-oh-moan-ass) is a medium-sized heterotrophic flagellate with two similar flagella emerging from a point just behind the apex of the cell. The ventral surface is grooved (and this causes a slight indentation at the front of the cell). Pseudopodia may arise from the ventral groove. They consume diatoms and other detritus. DIfferential interference microscopy.
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Cryothecomonas (cry-oh-theek-oh-moan-ass) is a medium-sized heterotrophic flagellate with two similar flagella emerging from a point just behind the apex of the cell. The ventral surface is grooved (and this causes a slight indentation at the front of the cell). Pseudopodia may arise from the ventral groove. They consume diatoms and other detritus. Phase contrast microscopy.
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Cryothecomonas (cry-oh-theek-oh-moan-ass) is a medium-sized heterotrophic flagellate with two similar flagella emerging from a point just behind the apex of the cell. The ventral surface is grooved (and this causes a slight indentation at the front of the cell). Pseudopodia may arise from the ventral groove. They consume diatoms and other detritus. Phase contrast microscopy.
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Cryothecomonas aestivalis Drebes et al., 1996. Colourless flagellates, in the free, motile stage, oblong to oval, 9-12 microns long and 4-5 microns wide, two apically inserted flagella, anteriorly directed flagellum 15 microns long, posteriorly directed flagellum up to 25 microns Feeds on the marine planktonic diatom Guinardia delicatula. Flagellate penetrates the diatom frustule. Trophonts gradually phagocytize the host cytoplasm by means of a pseudopodium, which emerges posteriorly through a gap in the theca. Theca delicate, consisting of two layers, occasionally lacking. Trophonts and division stages with shortened, in part basally thickened flagella. Mature trophonts give rise to 8-32 new flagellates (swarmers). Defecation before the last division.
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Protaspis (pro-tass-piss) A very common but little studied genus of gliding flagellates, two flagella inserted one in front of the other in a shallow ventral depression near the front of the cell. One flagellum trails behind the cell, one sweeps in front of the cell. There are caps (dictyosomes?) over the nucleus and these can be seen as two lines leading away from the site of flagellar insertion. Protaspis can produce pseudopodia and may eat diatoms. This individual has starchy inclusions. Phase contrast.
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Protaspis (pro-tass-piss) A very common but little studied genus of gliding flagellates, two flagella inserted one in front of the other in a shallow ventral depression near the front of the cell. One flagellum trails behind the cell, one sweeps in front of the cell. There are caps (dictyosomes?) over the nucleus and these can be seen as two lines leading away from the site of flagellar insertion. Protaspis can produce pseudopodia and may eat diatoms. This individual has starchy inclusions. Phase contrast.
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Protaspis (pro-tass-piss) A very common but little studied genus of gliding flagellates, two flagella inserted one in front of the other in a shallow ventral depression near the front of the cell. One flagellum trails behind the cell, one sweeps in front of the cell. Protaspis can produce pseudopodia and may eat diatoms. This individual has starchy inclusions. Phase contrast.
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Protaspis (pro-tass-piss) is a medium-sized heterotrophic flagellate. Two flagella emerge close to each other from a point behind the apex of the cell and on the ventral side. The anterior flagellum is typically shorter than the posterior flagellum. The ventral side may give rise to pseudopodia which can enclose food - such as diatoms. Phase contrast microscopy.
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Protaspis (pro-tass-piss) is a medium-sized heterotrophic flagellate. Two flagella emerge close to each other from a point behind the apex of the cell and on the ventral side. The anterior flagellum is typically shorter than the posterior flagellum. The ventral side may give rise to pseudopodia which can enclose food - such as diatoms. In this image, many cells have fused into a syncitium. Phase contrast microscopy.
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Protaspis (pro-tass-piss) is a medium-sized heterotrophic flagellate. Two flagella emerge close to each other from a point behind the apex of the cell and on the ventral side. The anterior flagellum is typically shorter than the posterior flagellum. The ventral side may give rise to pseudopodia which can enclose food - such as diatoms. In this image, many cells have fused into a syncitium. DIfferential interference microscopy.
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Biflagellate protist with a ventral furrow and anterior depression from where the two flagella emerge. Species not identified. Isolated by M. Virginia Sanchez Puerta from Sippewissett Pond, Woods Hole, MA, USA. Photographed using DIC microscopy.
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Protaspis (pro-tass-piss) obliqua Larsen and Patterson, 1990. Cells are slightly oval or roundish, 8 to 32 microns long, 10 to 27 microns wide, dorso-ventrally flattened and with thickened cortex. There is a ventral median groove, cell indented anteriorly and posteriorly where the groove meets margin. Subapically, the right margin of the groove forms a protrusion. With two flagella inserting under the protrusion, the anterior flagellum is about 0.5 times the length of the cell and the posterior flagellum is about 0.5 to 1.5 times the length of the cell. The nucleus is without nuclear caps, is located subapically in a median position, is rounded and is 5 to 13 microns in diameter. The cells may contain food particles or diatom up to 24 microns long. Commonly observed.
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Protaspis obliqua Skuja, 1939. Cells are slightly oval or roundish, 8 to 32 microns long, 10 to 27 microns wide, dorso-ventrally flattened and with thickened cortex. There is a ventral median groove, cell indented anteriorly and posteriorly where the groove meets margin. Subapically, the right margin of the groove forms a protrusion. With two flagella inserting under the protrusion, the anterior flagellum is about 0.5 times the length of the cell and the posterior flagellum is about 0.5 to 1.5 times the length of the cell. The nucleus is without nuclear caps, is located subapically in a median position, is rounded and is 5 to 13 microns in diameter. The cells may contain food particles or diatom up to 24 microns long.
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