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One of the most impressive photosynthesizers is a cyanobacterium called Prochlorococcus. It is estimated to be more abundant than any other photosynthesizer on the planet, and to be responsible for producing 20 percent of the oxygen in the atmosphere.
Video

Meet the obscure microbe that influences climate, ocean ecosystems, and perhaps even evolution

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A side-view of a translucent phronima with a large red eye.
Photo

Phronima Alien

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10 grains of star shaped sand collected from southern Japan
Photo

Star Sand Grains Collected from Southern Japan

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Dinoflagellates are major producers of oxygen in the ocean (and freshwater). But some species can grow out of control, causing a red tide.
Photo

Dinoflagellate

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Small red hyperiid.
Slideshow

The Hyper Eyes of Hyperiids: How Some Shrimp-Like Creatures See Light in the Deep Sea

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A spiraled diatom with spines.
Photo

A Diatom Helix

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microscopic organisms of different shapes
Photo

Protists of the Atlantic

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Zooplankton are small—but do you know just how small? This drop of water smaller than the eye of a needle is magnified 20x and contains multitudes.
Photo

Zooplankton in the Eye of a Needle

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Cartoon t-shirts with got plankton.
Article

The Cloud Factories that Live in the Sea

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A female (top left) and male Photerus annecohenae. Note that females are larger than males (sexual dimorphism) and that males have bigger eyes.
Article

You Light Up My World!

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a phytoplankton in a swirl
Photo

Phytoplankton

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Two small, translucent hyperiids with very large eyes.
Photo

Paraphromina

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