Placoderm

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What Wikipedia says

Placoderms (from Ancient Greek πλάξ [plax, plakos] 'plate' and δέρμα [derma] 'skin') are vertebrate animals of the class Placodermi, an extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian periods.

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

Image: Auteur inconnu, Public domain, via Wikimedia Commons.