Petalodontiformes

Rarity: Common

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What Wikipedia says

Petalodontiformes ("thin-plate teeth") is an extinct order of marine cartilaginous fish related to modern day chimaera found in what is now the United States of America and Europe.

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

Image: Stanton F. Fink, CC BY-SA 3.0, via Wikimedia Commons.