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he largest known protist is the xenophyophore Syringammina fragilissima. Xenophyophores are one-celled, multinucleate creatures found at depths of 800 to 6000 meters on the ocean floor. A characteristic feature of xenophyophores is that they construct a sort of artificial exoskeleton by gluing together particles of sediment and the microscopic shells of foraminifera. (The name "xenophyophore" is Greek for "foreign body bearer.") These agglomerations are called tests.

In the case of S. fragilissima, the test is a network of tubes. The tests are extremely fragile, and specimens are rarely recovered.

In 2006 in an area called the Darwin Mounds, northwest of Scotland, researchers discovered specimens of Syringammina fragilissima with tests as large as 20 centimeters in diameter.

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∙ 14y ago
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