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Coccolithophorids ("round-stone-bearers") are named after their coccoliths,
CaCO3 scales that form the cell wall. The coccoliths of different species have
diverse shapes and ornamentations and can be used for taxonomic identification.
Coccolithophorids are small organisms - their cells range in size from only
0.2-2µm - and so are difficult to view in the context of a classroom setting.
You need a great microscope (usually only a scanning electron microscope will
do), a book of micrographs, or some time looking at websites to be able to
appreciate the diversity and beauty of these stunning organisms.
Like many phytoplankters, coccolithophorids can form immense blooms - in this
case, the blooms are so distinctive, they can be seen from satellite
pictures. When the coccoliths from these blooms settle down to the ocean floor,
they create thick deposits which, through geological processes, form chalk -
including chalk used for classroom chalkboards! The famous white cliffs of
Dover, in southern England, are the result of Coccolithophorid blooms and
coccolith deposits.
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