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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 (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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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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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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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 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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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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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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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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SEM of a resting spore. Scale bar indicates 10 µm. Sample from North Sea near Heligoland (spring diatom bloom). Use of SEM equipment courtesy of Lab Dr. Karl-Heinz Schäffner, Solingen, Germany.
