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| The diatom Actinoptychus, LM |
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| The diatom Actinoptychus. LM, darkground illumination. |
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| Freshwater diatom frustules, light microscope |
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| A fossil centric diatom, interference micrograph |
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| Diatom - Arachnoidiscus ehrenbergii |
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| Diatom - Navicula lyra |
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| A fossil centric diatom, interference micrograph |
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| Diatom: Aulacodiscus formosus |
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| Diatom: Aulacodiscus formosus |
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| Centric marine diatom |
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| Centric marine diatom. |
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| Diatom frustules, light microscope |
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| Diatom frustules, polarising microscope |
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| A marine diatom, Podocystis spathulata |
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| Centric marine diatom |
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| Diatom frustule |
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| Diatom frustule |
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| Diatom frustule |
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| Diatom frustule |
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| Marine diatom |
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| Diatom frustule |
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