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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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Diurella percellus Gosse, Left side of extended specimen.
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Diurella tenuior Gosse. Larger specimen, dorsal or dorso-dextral view.
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Monostyla cornuta Ehr. Ventral view.
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Taphrocampa annulosa Gosse, as seen from above; body curved so that the food is not visible.
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Pleurotrocha parasitica n. sp. Ventral view.
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Yongting Luo, Hendrik Segers
Zookeys
Figure 1.Pulchritia dorsicornuta gen. n., comb. n., compound photomicrograph.
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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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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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San Martin De Castaneda, Castille and Leon, Spain
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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