STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Calcareous phytoplankton. Coloured scanning electron micrograph (SEM) of Calyptrosphaera oblonga. This small algal organism (coccolithophore) is surrounded by a skeleton (coccosphere) of calcite crystals (coccoliths). C. oblonga is a holococcolith, which means that the coccoliths formed are identical in shape and size.
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