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Vilobi Del Penedes, Catalonia, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Barrio Ballinas, Castille and Leon, Spain
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Astasia (a-stays-ee-a) is a colourless euglenid, probably having derived from a lineage with plastids. With one emergent flagellum (by which it can be distinguished from Distigma which is similar but has two emergent flagella. There is no mouth, although this cell is unusual in that it has inclusions - indicating that it has ingested sulphur bacteria and cyanobacteria. Flagellum with whiplash beat (loops are flicked along the length of the flagellum, and in swimming cells these tend to be directed towards the rear so that the cell swims forward following a spiral path. Phase contrast.
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Astasia (a-stays-ee-a) is a colourless euglenid, probably having derived from a lineage with plastids. With one emergent flagellum (by which it can be distinguished from Distigma which is similar but has two emergent flagella. There is no mouth. Most of the refractile granules are polysaccharide storage materials. Differential interference contrast.
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Astasia (a-stays-ee-a) is a colourless euglenid, probably having derived from a lineage with plastids. With one emergent flagellum (by which it can be distinguished from Distigma which is similar but has two emergent flagella. There is no mouth. Most of the refractile granules are polysaccharide storage materials. The clear area near the front of the cell is the region of the flagellar pocket (where the flagella attach to the cell) and contractile vacuole. The relatively homogeneous region in the centre of the cell is where the nucleus is located. Differential interference contrast.
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Astasia curvata Klebs, 1893. Astasia cells that are spindle-shaped or cylindrical, somewhat flattened, strongly curved with tapered ends. Anterior end opened and posteriorly pointed. Cells strongly metabolic, 32-40-60 microns long, 5-8 microns broad. Flagellum about 0.5-0.66 times cell length. Many small oblong paramylon granules. Nucleus ellipsoidial, almost central.