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Het raderdier Keratella tropica
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Los Limites, La Rioja, Spain
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Melgar de Tera, Castille and Leon, Spain
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Lorica vase-shaped and thin. Foot long, toes shorter than rest of body.
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Soba, Cantabria, Spain
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It is caracterised by a round tail and short toes.
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Madrid, Madrid, Spain
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Ribadelago de Franco, Castille and Leon, 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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Lardero, La Rioja, Espaa
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The species are omnivorous, frequently feeding upon bacteria, debris and small protozoans.
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Lorica consists of one piece and in cross section the dorsal sulcus is "V" shaped. There are four spine-like projections at the anterior and which also bears very small spines.
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Ribadelago de Franco, Castille and Leon, Spain
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Lenght 200 micron
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Ribadelago, Castille and Leon, Spain
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Lagostelle, Galicia, Espaa
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Vigo, Castille and Leon, Spain
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Miranda do Douro, Bragana, Portugal
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Lumbreras, La Rioja, Spain
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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.