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Keratella, a rotifer (metazoa). Rotifers typically have a stiffened body wall (lorica) in segments which can telescope, with a corona of feeding cilia at the anterior end and with toes posteriorly. This genus has no foot nor toe, as an adaptation to a pelagic life. Rotifers are common members of the microbial communities of many aquatic ecosystems. Although they are multicellular animals, they may be only be 100 microns long, and so overlap in size with ciliates. They can be confused with ciliates because they use cilia to capture their food. However, they can be distinguished because they have a lorica, may have podites, and a strong muscular pharynx.
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Los Limites, La Rioja, Spain
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Segmented, moderately rigid foot. Two posterior and two anterio-median spines
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Alcala De Guadaira, Andalusia, Spain
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Ribadelago, Castille and Leon, Spain
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Lagostelle, Galicia, Espaa
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Posterior region
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Under favourable temperature conditions its abundance appeared to be closely related to that of Asterionella formosa.
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Mahide, Castilla y Len, Espaa
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Sobrado, Galicia, Spain
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San Martn de Castaeda, Castilla y Len, Espaa
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Ribadelago de Franco, Castille and Leon, Spain
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A somewhat withdrawn individual - rotifers can be like that. Differential interference contrast optics.
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Los Limites, La Rioja, Spain
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San Martin De Castaneda, Castille and Leon, Spain
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Head region
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Ribadelago de Franco, Castilla y Len, Espaa
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Body size 200-400 micron. Lorica smooth or faintly striped. Foot opening tube-shaped. Body very broad and flat. Median anterior spines long, more or less curved. Posterior spines present short or long.
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Ribadelago de Franco, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Ribadelago de Franco, Castilla y Len, Espaa
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San Martin De Castaneda, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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http://www.cfb.unh.edu/CFBKey/html/Organisms/PRotifera/GKeratella/keratella_quadrata/keratellaquadrata.html
Marine Rotifera LifeDesk
Keratella quadrata