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Salt water centric diatom frustule (skeleton). Diatoms are microscopic, unicellular algae that produce intricate silica (glass) cell walls that overlap like the top and bottom of a box. When diatoms die, their soft, internal parts deteriorate, leaving their hard, porous, glass skeletons behind. Diatoms are found in aquatic environments, and saltwater diatom skeletons appear in the fossil record as early as the Jurassic period (180 million years ago). In the United States, numerous deposits…

Centric fossil freshwater Diatom frustule, Klamath Falls Oregon, USA. SEM X600

Head of a mosquito under a microscope.

Rotifers Rotifers are tiny multicellular organisms found commonly in freshwater environments around the world. Image by Dr. Igor Siwanowicz, HHMI Janelia Farm Research Campus.

Room for one more......

Diatoms are microscopic algae composed of separate halves, with delicate siliceous cell walls. They're usually single-celled organisms, though some live colonially. They inhabit fresh and salt waters and are among the most abundant of all phytoplankton.

The human egg. Microscopic

Diatoms are a major group of algae, and are among the most common types of phytoplankton.

The GMO that could have killed nearly all life on Earth