Ptychodus

Rarity: Common

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At a glance

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What Wikipedia says

Ptychodus (from Greek: πτυχή ptyche 'fold' and Greek: ὀδούς odoús 'tooth') is a genus of extinct durophagous (shell-crushing) lamniform sharks from the Cretaceous period, spanning from the Cenomanian to the Campanian. Fossils of Ptychodus teeth are found in many Late Cretaceous marine sediments worldwide.

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

Image: diestmmederwir00abel, No restrictions, via Wikimedia Commons.