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SEM of dividing cell.
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Scanning electron micrograph of anterior end.
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Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. This work was supported by the Australian Biological Resources Study.
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Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Phacus monilatus. Cell observed in freshwater habitats in the vicinity of Broome, Western Australia in September 2003. This image was taken using differential interference contrast optics. This work was supported by the Australian Biological Resources Study.
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Distigma sennii Pringsheim, 1942. Metabolic swimming euglenid, cell typically club-shaped, broader anteriorly and truncated with an apical canal-opening, the posterior end of cell tapers, cells are 40 - 62 microns long. With two flagella, unequal in length. The longer flagellum is about 0.25-0.35 cell length and the recurrent flagellum is very short (5 - 6 microns), slightly curved and directed sideways or to the posterior of the cell. The pellicle seems smooth. The reservoir is in the middle of the cell with an associated contractile vacuole. A nucleus is located centrally or slightly behind the centre of the cell. The cell contains a large number of ellipsoidal or cylindical refractile grains and when swimming the cell moves quickly and rotates.
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Urceolus sabulosus Stokes, 1886. Cells about 40 microns long, flask-shaped, soft, flexible and elastic, normally compressed and somewhat gibbous, about twice as long as broad, widest centrally, obtusely pointed posteriorly, the entire surface more or less covered, often almost concealed, by adherent, irregular and angular sand grains, anterior end constricted to form a short neck-like prolongation, the circular border thickened, expanded, and obliquely truncate, flagellum large, equaling or exceeding the body in length, nucleus not observed, contractile vacuole (?) single, laterally placed near the anterior end, pharaynx apparently extending to near the body centre. Length of Body 51 microns Numerous grains of sand stick to cell surface. Flagellum about cell length or somewhat longer.
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Phacus balatonicus, short flattened euglenoid flagellate with no or negligible point at the posterior end, pellicle typically with single longitudinal fold in addition to the fine ridges. Many small discoid chloroplasts. Red stigma. Central circular paramylon body . This individual has shed its flagellum. From freshwater pond near Boise,Idaho. Brightfield.
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Phacus contortus (BOURRELLY,1952). DIC.
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Phacus contortus (BOURRELLY,1952). Brightfield.
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Phacus contortus (BOURRELLY,1952). DIC.
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Phacus contortus (BOURRELLY,1952).Brightfield.
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Phacus pleuronectes, euglenoid flagellate with a rigid, leaf-shaped pellicle with fine longitudinal striations and short curved spinous posterior. Many discoid chloroplasts. Usually with one large circular central paramylon body (although two are seen in this individual). Red stigma. From freshwater pond near Boise, Idaho. Brightfield
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Phacus pyrum or P. rudicula, a small euglenoid flagellate having a pyriform rigid pellicle thrown into folds (P. pyrum is described as round in cross section while P. rudicula is said to be more flattened as is the cell shown here, but it is likely the two are different forms of the same species). With oblique ridges and tapering, pointed posterior. Red stigma. These individuals have shed their flagella which are usually about 1½ body length. From freshwater pond near Boise, Idaho. Oblique illumination.
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Distigma (die-stig-ma), heterotrophic euglenid flagellate. There are two flagella which are attached to the cell in a flagellar pocket which is an invagination that leads to the front of the cell by a tube called the flagellar canal. The light disc near the front is the contractile vacuole which is located alongside the flagellar pocket which cannot be seen in this image. One flagellum is long, the other short. The cytoplasm has large amounts of paramylon granules. The cell can squirm (is metabolic). Phase contrast.
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Distigma proteus Ehrenberg, 1838. Body highly metabolic, scarcely ever presenting the same contour, usually more or less elongate, with irregular constrictions and distensions, longer flagellum nearly equaling the body in length, the shorter one scarcely one quarter that length, endoplasm transparent, enclosing numerous dark coloured refringent corpuscles whose positions are constantly shifting from one extremely to the other in accordance with the peristaltic motions of the body, two minute, blackish, eye-like pigment-spots usually developed at the anterior extremity, tubular pharynx slender, greatly prolonged, contractile vacuole conspicuous, located close to the termination of the pharynx, nucleus ovate, subcentral. Length 44-106 microns