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Chaetoceros (key-toss-err-oss), a centric diatom in which the short cylindrical cells form long spines. Cells often joined to form short filaments. Common in marine ecosystems. Phase contrast.
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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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Note that setae also contain protoplasm and even chloroplasts. Scale bar indicates 200 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking and stitching technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Chaetoceros (key-toss-err-oss), a centric diatom in which the short cylindrical cells form long spines. Cells often joined to form short filaments. Common in marine ecosystems. Phase contrast.
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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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Note that setae also contain protoplasm and even chloroplasts. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Marine centric diatom, occurs in chains with long threads extending from the ends of each cell. Collected with 20 micron net in Pojo Bay at Ångskär, 40 metre deep, Secci 6.3 metre, 4th April 2012
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This species consists of very small cells which are united into curved chains. Cells have three short setae and one long one which causes the formation of larger secondary colonies by linking up in the centre of the colony with the long setae of other chains
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This is a termperate species often occurring in coastal waters. The cells are usually slightly longer than wide and bear long setae arranged around the valve margin, setae of adacent cells are fused for some distance before branching. The setae of the terminal cells have different morphology.
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Bacteriastrum, found as a fairly abundant member of the surface phytoplankton community in a plankton-net sample taken off Martha's Vineyward in Massachusetts, USA. Image by J. Cole.
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This species forms straight and often long chains. Width and shape of constrictions are very variable, from hexagonal to slit like. This species has two distinct types of inner setae. The setae are mostly very thin but some setae are short and thickened and undulating with small spines and are pointing towards the end of the chain.
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Beautiful image made by someone and forgotten in the realms of the hard drive.
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This species forms curved, spiralling chains. Valves are elliptical, concave with drawn up poles (apical length: 10-30 microns). The setae emerge from slightly within the valve margin. Setae are perpendicular to the chain axis and directed towards the outside of the chain spiral.
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Cleaned frustule from a plankton tow taken off Martha's Vineyard, Massachusetts. Preparation and image by Charley O'Kelly.
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Circular chain of cells. Scale bar indicates 50 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Cells solitary or forming short chains (apical axis 13-18 microns). Setae emerge from the valve margin perpendicular to the pervalvar axis, they only diverge slightly from the apical plane
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Valvar view, framed wih Odontella aurita. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Cingular view, phase contrast. Note that protoplasm and chloroplasts are also present in the setae. Scale bar indicates 50 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Cells of C. decipiens form straight chains. Apical axis of cells 30-55 microns, pervalvar axis usually shorter. Setae are originating at the valve margin. Characteristically sister setae are fused for a length several times their diameter.
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Chaetoceros decipiens accompanied by Chaetoceros curvisetus. Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Scale bar indicates 100 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Slightly twisted chain of Chaetoceros radicans or perhaps Ch. tortissimus. Scale bar indicates 50 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Twisted chain of cells. Scale bar indicates 50 µm. Sample from North Sea near Heligoland (spring diatom bloom). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.