Longest belemnite

Possessing a hard internal bullet-shaped skeleton known as a guard, and with 10 arms of equal length, belemnites constituted a long-extinct group of marine cephalopod molluscs, related to today's squids. The longest known species of belemnite was the giant belemnite Megateuthis gigantea, which had an estimated total length of 3–5 m, and a guard length of up to 46 cm. Native to Asia and Europe, it lived during the Jurassic Period (145–201 million years ago).