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Euglena gracilis (you-glean-a grass-ill-iss). Euglena is the iconic genus of euglenoid flagellates, and this is probably the most familiar of the species. The body of most euglenids is typically spindle-shaped, although two flagella arise in a pocket within the cell only one emerges (and sometimes none). The body can squirm, and the cell has one to many chloroplasts. At the anterior of the body a thin channel (flagellar canal) leads to the flagellar pocket, and alongside this is a contractile vacuole. A red eyespot or stigma is associated with the bottom of the flagellar canal. This image shows the nucleus (central). the region of the flagellar pocket as the lighter region to the right, the associated stigma, the single emergent flagellum, and several green chloroplasts. Phase contrast.
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Euglena sanguinea - a brightfield portrait of this slow swimming species pigmented with hematochrome granules. Granules aggregate as seen here in low light conditions and disperse with increases in either water temperature or light intensity. Flagellum typically body length but not seen here. Small spindle shaped chloroplasts often spirally aligned with pellicular striations. Also referred to as E. rubra. Collected from freshwater pond near Boise, Idaho.
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Villar del Buey, Castile and Len, Spain
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Logrono-Agoncillo Airport, La Rioja, Spain
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A Veiga, Galicia, Spain
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Puras de Villafranca, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Portrait of Trachelomonas, a loricate euglenoid flagellate. Lorica in this species has distinct collar with an aperture through which a single flagellum emerges. The lorica has been fractured exposing the cell body with its prominent stigma and thin discoid peripheral plastids. From freshwater pond near Boise, Idaho.Brightfield.
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Euglena gracilis (you-glean-a grass-ill-iss). Euglena is the iconic genus of euglenoid flagellates, and this is probably the most familiar of the species. These cells have been compressed, but the body is usually spindle-shaped. Although two flagella arise in a pocket within the cell only one emerges. The body can squirm, and the cell has many chloroplasts. At the anterior of the body a thin channel (flagellar canal) leads to the flagellar pocket, and alongside this is a contractile vacuole. A red eyespot or stigma is associated with the bottom of the flagellar canal. This image shows the nucleus (central). Differential interference contrast.
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Detail of the anterior end of a Euglena cell, collected at Beaver Lake, showing the flagellar pocket, a very short flagellum with a swollen basal region (the flagellum is not long enough even to project from the front of the cell). The eyespot is closely associated with the flagellum.
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Villar del Buey, Castile and Len, Spain
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Tamarindos, Valencia, Spain
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Navas de Estena, Castille la Mancha, Spain
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Euglena gracilis. 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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This image of Euglena, collected from Beaver Lake, emphasizes the disk- shaped chloroplasts. The front of the cell is to the left. The light area is called the reservoir. Adjacent to this region is the red eyespot that helps to control the direction in which the cells move. The granular region in the center of the cell is the nucleus.
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Villar del Buey, Castile and Len, Spain
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Cadaques, Catalonia, Spain
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Villoslada de Cameros, La Rioja, Spain
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Trujillo, Extremadura, Spain
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Whole cell, the dark eyespot is near the front and adjacent to it is the flagellar pocket / reservoir / contractile vacuole region. the nucleus is the clear structure near the posterior of the cell. The positions of about 6 large plastids can be worked out. Animations by Rosemary Arbur of flagellar beat patterns are available
here.
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Euglena. Cyst 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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Villar del Pedroso, Extremadura, Spain
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