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There are far, far too many too list, however, here are a few:

Trilobites: animals similar in appearance to the horseshoe crab, that lived from 526 to 250 million years ago.

Anomalocaridids: long and narrow, invertebrate carnivores that lived from about 500 to 400 million years ago.

Ammonites: invertebrates with a snail-like shell that protected a squid-like body, and floated in the ocean, who lived from 400 to 65.5 million years ago.

Icthyosaurs: marine reptiles that resembled dolphins, or fish, and lived from 245 to 90 million years ago.

Plesiosaurs: marine reptiles with long or short necks, who ate fish and swam with flippers, and lived from 210 to 65.5 million years ago.

Hesperornithes: Fully aquatic birds that lived from 100 to 65.5 million years ago.

Mosasaurs: Huge, carnivorous marine lizards (up to 40 feet long), that lived from 85 to 65 million years ago.

Enchodus (or saber toothed herring): a small to medium predatory fish with two long "fangs," that lived from the late Cretaceous to the Eocene (perhaps 100 to 40 million years ago).

Basilosaurus: a very long and narrow relative of whales, that lived from 40.4 to 33.9 million years ago.

Megalodon: a shark that may have been up to 50 feet long, and lived from 25 to 1.5 million years ago.

There are also a number of prehistoric ocean animals that still exist today, such as:

Sharks and rays: evolved about 416 million years ago.

Coelocanth: a type of fish related to lungfish that evolved about 400 million years ago.

Cephalopods (invertebrates such as squid and octopi): evolved about 400 million years ago.

Barnacles: evolved about 500 million years ago.

Coral (yes, they are animals): evolved about 542 million years ago, although modern coral reefs didn't first appear until about 245 million years ago.

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14y ago

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