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Age: 500 million years
Nautilus has been living on Earth way before the Dinosaurs ruled it. These marine mollusks are one of the earliest shellfish, and at present, these are the only surviving shellfish in the whole world. Also described as “living fossils” Nautilus live very deep in the ocean and are hard to come by. The outer body is made up of the shell, and the mouth has consists of some 100 tentacles that makes it look like an octopus.