Scanning electron micrograph of a fragment of surface of diatom cell. Diatoms have a silica cell wall also called a frustule that has regularly repeating features.

Darkfield illumination image of a diatom from a oamaru fossil. Honorable Mention, 2010 Olympus BioScapes Digital Imaging Competition®.

Scanning electron micrograph of a diatom frustule. The frustule is the hard and porous cell wall or external layer of diatoms.

Differential interference contrast image of a diatom with tiny bits of shell from other diatoms on it. Honorable Mention, 2010 Olympus BioScapes Digital Imaging Competition®.

Scanning electron micrograph of a diatom showing the two silica based frustule (cell walls). Image also illustrates the regular pattern on the frustule.

Scanning electron micrograph of a diatom frustule. The frustule is the hard and porous cell wall or external layer of diatoms.

Colorized scanning electron micrograph of a diatom frustule. Diatoms are unicellular organisms and a major group of algae. Diatoms are encased within a hard cell wall made from silica (glass) known as...

Choanoflagellate

Brightfield micrograph of a living diatom (Mediopyxis helysia) showing the cell nuclei and golden chloroplasts. There is a bacteria colony in mucilage located on the top of the diatom. The image won ...