Heterodontiformes

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What Wikipedia says

Heterodontiformes is an order of sharks in the superorder Galeomorphi. It includes the bullhead sharks (genus Heterodontus), and several extinct genera. The earliest known members of the group are from the Early Jurassic (Toarcian), around 175 million years ago.

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

Image: OpenCage Systems, CC BY-SA 2.5, via Wikimedia Commons.