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[mahy-kroh-fos-il] /ˌmaɪ kroʊˈfɒs ɪl/

a so small that it can be studied and identified only with a microscope.
a fossil generally less than 0.5 millimetre in size, such as a protozoan, bacterium, or pollen grain
A microscopic fossil, as of a pollen grain or unicellular organism.


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  • Microgametocyte

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  • Microgametophyte

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