Fusulinida

Rarity: Common

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At a glance

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Knowledge cost

2

Influence

2

Resistance

4

In collections

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What Wikipedia says

The Fusulinida is an extinct order within the Foraminifera in which the tests are traditionally considered to have been composed of microgranular calcite. Like all forams, they were single-celled organisms. In advanced forms the test wall was differentiated into two or more layers.

Excerpt from the Wikipedia article “Fusulinida”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Wilson44691, CC BY-SA 3.0, via Wikimedia Commons.