Diatom frustules. Coloured scanning electron micrograph (SEM) of Campylodiscus hibernicus, a freshwater diatom. Magnification: x440 when printed 10cm wide.
Diatoms are a major group of algae, and are one of the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons, fans, zigzags, or stellate colonies.
Fossilised diatoms, SEM
Diatoms: Group of cleaned frustules
Photo: Freshwater diatoms
Licmophora flabellata microscopic diatom found in the ocean often living attached to seaweed
Diatom frustules Science Image Coloured scanning electron micrograph (SEM) of Mastogloia splendida (oval) and Navicula palpebralis (elongated) diatom frustules. Magnification: x2,490 when printed 10cm wide