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Diagrams based on and electron microscopy, the axoplast is located inside a concavity of the nucleus, axopodial microtubules arise from the axoplast and traverse the nucleus through channels, the microtubules forming the axopods are arranged in squared packed arrays, the two basal bodies/flagella are linked to the axoplast (from G. Brugerolle and J.-P. Mignot)
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Clautriavia (claw-tree-ave-ee-a) cavus Lee and Patterson, 2000. Cell outline is oval to oblong. Cells are 7.5 to 10 microns long, flattened and rigid. One flagellum directed posteriorly emerges from a ventral subapical depression, is about 1.5 to 2 times the length of the cell and makes close contact with the substrate when the cell is gliding. The cells have a shallow, wide ventral groove, which is easy to overlook. The ventral face of the cell appears to be slightly concave. The cell surface may be rather warty and food particles are seen in the posterior part of the cell. The cells glide slowly and smoothly with the posterior part slightly raised above the substrate. Often observed, but not in large numbers. Rarely observed.
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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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Hermesinum adriaticum Zacharias, 1906. The skeleton of this species is asymmetrical and difficult to describe. The skeleton is 48-50 microns long, 20 microns wide at its widest point and 12 microns high.
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Clautriavia cavus Lee and Patterson, 2000. Cell outline is oval to oblong. Cells are 7.5 to 10 microns long, flattened and rigid. One flagellum directed posteriorly emerges from a ventral subapical depression, is about 1.5 to 2 times the length of the cell and makes close contact with the substrate when the cell is gliding. The cells have a shallow, wide ventral groove, which is easy to overlook. The ventral face of the cell appears to be slightly concave. The cell surface may be rather warty and food particles are seen in the posterior part of the cell. The cells glide slowly and smoothly with the posterior part slightly raised above the substrate. Often observed, but not in large numbers.
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Ebria (ee-bree-a) A small group of marine flagellates, although may be abundant, and large numbers have been assoicated with fish kills. They deposit complex siliceous endoskeletons within the cells. As you can see. Differential interference contrast.
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Allas (a-lass) rarely reported gliding flagellate from soils, rounded body, two flagella. Nuclear region is the light area in the centre of the cell. Contractile vacuole (usually there are two) near the point of flagellar insertion. Phase contrast.
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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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Ebria (ee-bree-a) A small group of marine flagellates, although may be abundant, and large numbers have been assoicated with fish kills. They deposit complex siliceous endoskeletons within the cells and (as in this case) the skeleton may be found on its own. The ebriids have been implicated in fish kills. Phase contrast.
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Allas (a-lass), rarely reported gliding flagellate from soils, dividing. Division in most flagellates begins with a doubling of the n umber of flagella, and then a division furrow splits the cell longitudinally. Contractile vacuoles (usually there are two per cell) are the clear inclusions near the point of flagellar insertion. Phase contrast.
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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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Ebria tripartita (Shumann, 1867) Lemmermann, 1899. Specimens of this species are almost spherical in shape and average 24 microns in diameter.
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Allas (a-lass), rarely reported gliding flagellate from soils, rounded body, two flagella. Group of cells. Phase contrast.
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Thaumatomastix salina (Birch-Andersen) Beech and Moestrup, 1986. Cells are ovoid (7-12 microns x 8-15 microns), slightly compressed dorso-ventrally, and have a long flagellum 3/4-5/4 of the cell length. A short flagellum, which is rarely visible, emerges together with the long flagellum from what appears to be a very slight groove or depression located latero-anteriorly. A furrow-like structure is often noted running from the flagellar bases to the cell midline. Cells are solitary, and are most often observed attached to pieces of detritus. Cells occasionally move in a creeping motion, with the long flagellum trailing and gliding over the coverslip. In some cases cells swim freely with the long flagellum making irregular, arhythmical flicking motions. The cell cytoplasm has a granular appearance and is devoid of any kind of chloroplast, a diffuse area of a pale orange colour can often be noticed in the central part of the cell when phase contrast oil immersion optics are used. One cell was noted in an early stage of division where both flagella had replicated. Spine scales, varying in length, radiate from the entire cell surface. Flattened cells slough off their scales and scales of a second type, spineless body scales, can then be seen to be elliptical in outline.
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Protocystis found wearing a crown of diatoms. Sample from the Amundsen Sea.
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A specimen from Villefranche in Feb 2012 showing what appears to be a feeding tube. A short video is on the Aquaparadox video page.
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A radiolarian, Protocystis xiphodon, showing a what looks like a feeding tube.
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Allantion tachyploon
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Allantion tachyploon
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Allantion tachyploon
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