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Fig 1: Schematic drawing of Pseudo-nitzschia pungens showing two closely packed rows of poroids.
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Pennate diatoms. The cells are enclosed in siliceous valves. There are typically two valves - a top one and a lower one, and they are joined together with fine bands or girdle strips. With plastids containing chlorophylls a and c (they are stramenopiles after all). Genera and species distinguished largely by the shape of the organism and the pattern of pores and sculptings of the siliceous shell or frustule. This pennate diatom is seen in valve view, there is an H shaped zone without sculptings in the frustule. Large plastids. The raphe is the two-part line running axially along the centre of the valve. Differential interference contrast.
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Two cells with stalk. Multi layer image using 20 frames generating depth of focus, stacked manually using Corel Photopaint. Collected from Bodden, the brackish waters lying between the isles of Hiddensee and Ruegen (German Baltic Sea). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Material from the Netherlands.
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Filamentous diatom commonly found near the Tvarminne Zoological Station. Previously known as Achnantes taeniata.
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Navicula excavata.
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[taxonomy:genus=Navicula]
Date:
23 Aug 2011
Location:
Drain on NUS science campus. Clear flowing water with scruffy brown debris at the bottom.
Microscope:
Bright-field with closed condenser aperture.
Camera:
Nikon D7000
Collector:
Brandon Seah
Scale:
20830 pixels/mm = 20.8 pixels/µm
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Lateral..
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Dab (platessa Imanda).
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Madrid, Comunidad de Madrid, Espaa
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Ribadelago, Castille and Leon, Spain
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Soba, Cantabria, Spain
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Trebabu, Brittany, France
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Pera, Faro, Portugal
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Miranda do Douro, Bragana, Portugal
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Miranda do Douro Municipality, Braganca, Portugal
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Alfaro, La Rioja, Spain
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Tirgo, La Rioja, Spain
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Lumbreras, La Rioja, Spain
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Barcelona, Catalonia, Spain
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Madrid, Comunidad de Madrid, Espaa
