Scientific name: Tuzoia sinensis There is also a piece of intestine that is exposed outside the body, which is very special An insect found only in China, a fossil specimen collected in Guanshan, Kunming, China Worm size: 7.2cm（The size is very large） Period: Cambrian Tuzoia lives in shallow or deep water and is a wide-phase arthropod. The Early and Middle Cambrian were large abdomenless bivalve shell arthropods that were widely distributed around the world, and their shells were composed of two shell lobes, left and right, and most of them were preserved as single-valve valves.