Coccosteus

Rarity: Common

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At a glance

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What Wikipedia says

Coccosteus (from Greek: κόκκος kókkos, 'berry' and Greek: ὀστέον ostéon 'bone') is an extinct genus of arthrodire placoderm from the Devonian period. Its fossils have been found throughout Europe and North America.

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

Image: Nobu Tamura (http://spinops.blogspot.com), CC BY 2.5, via Wikimedia Commons.