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https://en.wikipedia.org/wiki/Extinction

http://www.greenpolicy360.net/w/Tree_of_Life

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The Smallest Marine Plants

The smallest living things from the plant kingdom living in our oceans are single-celled green algae. These tiny cousins of the redwood tree can be measured at 5 micrometers or less, about five times larger than marine bacteria but still quite small. You would have to line up 5,080 of these little plants to reach 1 inch.

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The Smallest of the Small: Marine Viruses

Just as on dry land, the oceans are full of millions of viruses, by far the tiniest form of life. The smallest are about 40 nanometers in diameter. To put that into perspective, if you lined these marine viruses up end to end alongside a ruler, you would have to lay down 635,000 of them before hitting the 1-inch mark. Even the largest marine viruses are only about 400 nanometers.

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Zooplankton

Microscopic invertebrate animals that swim or drift in water

Base of the food chain

Sizes range from one-tenth of a millimeter to four millimeters (smaller than the head of a pin)