Galeaspida

Rarity: Common

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At a glance

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Knowledge cost

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Influence

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Resistance

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What Wikipedia says

Galeaspida (from Latin, 'Helmet shields') is an extinct taxon of jawless marine and freshwater fish. The name is derived from galea, the Latin word for helmet, and refers to their massive bone shield on the head.

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

Image: Apokryltaros at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.