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Fig 1: Schematic drawing of Pseudo-nitzschia pungens showing two closely packed rows of poroids.
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G. delicatula cells are cylindrica, with flat valves. Each cell as a spine extending from the valve margin. This spine fits into a depression on the adjacent cell to form chains. Few but large chromatophores are present usually at the cell periphery. This species can form large blooms in the spring and early summer
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Cells are heteropolar with a triangular foot pole which narrows into a thin extension. Cells are connected by the valve faces of the foot poles into chains which are often star-shaped. A. glacialis can form extensive blooms. A. glacialis is a cosmpolitan species.
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Note that the delicate spines are chitinous. Focus on valve surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Marginal silica processes are visible. Scale bar indicates 25 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Chaetoceros socialis (key-toss-err-oss sew-see-ah-liss), a centric diatom in with long spines. In this species dozens or hundreds of cells are linked loosely together by their spines. Common in marine ecosystems. Dark ground.
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Chaetoceros socialis (key-toss-err-oss sew-see-ah-liss), a centric diatom in with long spines. In this species dozens or hundreds of cells are linked loosely together by their spines. Common in marine ecosystems. Phase contrast.
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Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on frustule surface. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Chain of Porosira glacialis. Note that the delicate spines are chitinous. Focus on cell center showing cytoplasmic accumulation around the nucleus. Scale bar indicates 50 µm. The image was built up using several photomicrographic frames with manual stacking technique. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Inside view of lacunate valve. Note the position of the fultoportula on a valve face stria, taking the place of an areola. Specimen from single cell culture from Cleveland Harbor, Cleveland, Ohio, by E. Theriot.
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Scanning electron micrograph of interior of scutate valve. Note position of fultoportula in central area of valve face. Specimen from culture of cell isolated from Cleveland Harbor, Cleveland, OH, USA, by E. Theriot.
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Image shows chloroplasts, small sparkling droplets of storage matter, and the fine connection tubes between the cells. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Actinoptychus heliopelta.
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Navicula excavata.
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Terpsinoe americana by H. and M. PeragalloDiatomées marines de France et des districts maritimes voisins, par H. et M. Peragallo (b. 1851 and 1853, respectively). Publication info: Grez-sur-Loing,M. J. Tempère,1897-1908. Plate 90
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Terpsinoe americana by Henri CoupinFrom: Album général des diatomées marines, d'eau douce ou fossiles : album représentant tous les genres de diatomées et leurs principales espèces / par Henri Coupin (b. 1868).Plate 313: frustrules (600x magnification). sea water
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Dab (platessa Imanda).
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Ribadelago, Castille and Leon, Spain
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Pera, Faro, Portugal
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Soba, Cantabria, Spain
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Benissa, Valencia, Spain