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Pleurosigma (ploo-row-sig-ma) and Gyrosigma are two rather similar genera of sigmoid-shaped pennate diatoms found in intertidal sediments, salt marshes and so on. The nucleus is located at the centre of the cell. The plastids contain chlorophylls a and c which gives the yellowy-brown colour. This picture is taken of the surface of one of the valves and shows the raphe that is used in locomotion, and shows the plastids. Refractile globules are said to be the storage products from excessive photosynthesis. Pleuosigma is distinguished in part by the angled pattern of marks on the valve of the frustule. Differential interference contrast.
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Loxophyllum (locks-o-file-um) is one of several genera of flat gliding predatory ciliates. It glides along the substrate, exploring detritus with the anterior convex margin - which is where the mouth is located. There are rod-shaped extrusomes lying just under the cell membrane and in some species in prominences along the margins of the cell - not well developed in this cell. The extrusomes can be discharged to kill potential prey - usually other ciliates. Surface view of slightly squashed cell shows the surface folds where the rows of cilia (kineties) are located. Differential interference contrast.
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Loxophyllum setigerum, var. armatum. a,b,c: ventral, dorsal, and lateral aspects.
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Lionotus fasciola.
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Arcillo, Castille and Leon, Spain
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Sobrado, Galicia, Spain
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Olvega, Castille and Leon, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Pera, Faro, Portugal
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Ribadelago, Castilla y Len, Espaa
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Pleurosigma (ploo-row-sig-ma) and Gyrosigma are two rather similar genera of sigmoid-shaped pennate diatoms found in intertidal sediments, salt marshes and so on. The nucleus is located at the centre of the cell. The plastids contain chlorophylls a and c which gives the yellowy-brown colour. . Pleuosigma is distinguished in part by the angled pattern of marks on the valve of the frustule. Differential interference contrast.
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Loxophyllum (locks-o-file-um) is one of several genera of flat gliding predatory ciliates. It glides along the substrate, exploring detritus with the anterior convex margin - which is where the mouth is located. There are rod-shaped extrusomes lying just under the cell membrane and in some species in prominences along the margins of the cell - not well developed in this cell. The extrusomes can be discharged to kill potential prey - usually other ciliates. Phase contrast.
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Sobrado, Galicia, Spain
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Galende, Castille and Leon, Spain
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Ribadelago, Castille and Leon, Spain
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Pleurosigma (ploo-row-sig-ma) and Gyrosigma are two rather similar genera of sigmoid-shaped pennate diatoms found in intertidal sediments, salt marshes and so on. The nucleus is located at the centre of the cell. The plastids contain chlorophylls a and c which gives the yellowy-brown colour. . Pleuosigma is distinguished in part by the angled pattern of marks on the valve of the frustule. Differential interference contrast.
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Loxophyllum (locks-o-file-um) a predatory ciliate. It is flattened, and glides along the substrate, exploring detritus with the anterior convex margin - which is where the mouth is located. There are extrusomes just internal to the margin of the cell, and also in some species prominences along the margins of the cell - not well developed in this cell. The extrusomes can be discharged to kill potential prey - usually other ciliates. Common. Differential interference contrast.
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Ribadelago, Castille and Leon, Spain
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Pleurosigma (ploor-a-sig-ma) medium to large size pennate diatom, common in sediments. With browny coloured plastid located centrally, refractile globules are lipid inclusions. The cell is located within a shell (frustule) made of silica (glass) and the patterns of pores and strengthening elements is used to distinguish different taxa. Differential interference contrast.
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Phase contrast micrograph of living cell.
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Loxophyllum, a leaf-like predatory ciliate. The mouth lies along the convex side of the body. The convex side has a number of warts and each wart contains many extrusomes. Feeds on detritus and other protists. Phase contrast micrograph.
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This pennate diatom was found in a plankton tow from Nantucket Sound off Martha's Vineyard - Massachusetts, USA. Image by Jeffrey Cole and Micah Dunthorn.
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Loxophyllum. Cell observed in sandy and muddy marine sediments in the vicinity of Broome, Western Australia in September 2003. This image was taken using phase contrast optics. Â Â This work was supported by the Australian Biological Resources Study.