Xenacanthiformes

Rarity: Common

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What Wikipedia says

Xenacanthiformes (or Xenacanthida) is an order or superorder of extinct shark-like chondrichthyans (cartilaginous fish) known from the Carboniferous to the Late Triassic. They were native to freshwater, marginal marine, and shallow marine habitats. Some xenacanths may have grown to lengths of 5 m (16 ft).

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

Image: Nobu Tamura (http://spinops.blogspot.com), CC BY 2.5, via Wikimedia Commons.