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Diatoms are algae which live in little glass boxes or frustules - rather like little petri dishes. Pennate diatoms are motile, and rely on, we believe, the excretion of mucus through a slit in the wall - the slit is the raphe and runs down the flat faces of the petri dishes (frustules in diatom terminology). The frustule is perforated with tiny holes to allow the diatom to excrete waste products, and pick up nutrients, dissolved gases etc. from the surrounding water. This image shows the raphe and the pattern of sculpting in the frustule. Phase contrast.
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Navicula wrightii.
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Material from the Netherlands.
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Valves are rectangular in girdle view and elliptical in valve view. Each cell has four ribbon like and folded chloroplasts, two along each side of the girdle.
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Madrid, Comunidad de Madrid, Espaa
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Caada del Hoyo, Castilla-La Mancha, Espaa
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Arcillo, Castille and Leon, Spain
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Sogo, Castille and Leon, Spain
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Sant Marti Sarroca, Catalonia, Spain
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Bruz, Brittany, France
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Ribadelago, Castille and Leon, Spain
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Roma, Lazio, Italia
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Sant Marti Sarroca, Catalonia, Spain
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Original nib drawing made by Frenguelli.
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Original nib drawing made by Frenguelli.
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Longitude (deg): -1.3. Latitude (deg): 51.3. Longitude (deg/min): 1° 20' W. Latitude (deg/min): 51° 20' N. Vice county name: Berks. Vice county no.: 22. Country: England. Identified by: Malcolm Storey. Comment: In algal sample from temporary pool. Category: microscope photograph. Photographic equipment used: Pixera Pro tethered low-resolution digital camera with Meiji microscope using CS adaptor and x.7 projection eye-piece.
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Navicula (na-vick-you-la), small to medium pennate diatom, common in sediments. With browny coloured plastid contracted to the centre of the cell. 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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Campillos, Andaluca, Espaa
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Sant Marti Sarroca, Catalonia, Spain
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Original nib drawing made by Frenguelli.
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Original nib drawing made by Frenguelli.
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