Spider snail shell

Spider snails belong to the family Spiridae in the order Mesogastropoda. The shell of the spider snail is solid and solid, like a spider. The shell is 155 mm high, 80 mm wide, and there are about 9 layers of spiral shells. The shell surface is densely covered with thin spiral ribs. Above the sutures, the shell surface suddenly expands to form shoulder angles, on which there are undeveloped nodules. Above the spiral shell layer, there are two more developed nodule rows. Below the suture line of the lower spiral shell layer, there is a wide and flat annular protrusion. The shell is yellow white, mixed with brown spots and patterns. It is distributed in Taiwan, Hainan Island and the Xisha Islands in China, and widely distributed in the Indo West Pacific tropical sea area abroad.