Category: Plants

Ventricaria ventricosa, commonly known as Sailor’s Eyeballs, is the largest single-celled algae in the world. Its structure is based on a hard-shelled crust that shines like glass and is filled with a plasma-like fluid that builds one single cell.
Looking into them might remind of looking into a crystal ball or an alternative universe.

Sailor’s Eyeballs   © Ülar Tikk

There are two species that occur on reefs throughout the tropical Indo-Pacific on coral and rocky reefs where they are attached to the substrate by hair-like filaments called rhizoids.
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Underwater kelp forests exist all over the world and host a vast array of life. They can grow at depths up to 150 feet and still reach the surface with some giant kelps growing up to two feet in a day.

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Underwater Fact 51

The bases of almost all marine life forms are billions of microscopic single-celled plants, known as phytoplankton.

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Underwater Fact 12

The colour blue is least absorbed by seawater; the same shade of blue is most absorbed by microscopic plants, called phytoplankton, drifting in seawater.

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