Belemnites

Belemnites were marine animals belonging to the phylum Mollusca and the class Cephalopoda. Their closest living relatives are Squid and Cuttlefish. They had a squid-like body but, unlike modern squid, they had a hard-internal skeleton. In the animal’s tail, the skeleton formed a bullet-shaped feature sometimes referred to as a guard, but more correctly termed a rostrum. These are the parts that are normally found as fossils. Belemnites lived during the Jurassic and Cretaceous period, which lasted about 135 million years.

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