The spider's scientific name is Lambis chiragra. Its unique shell shape, shell mouth slender curved like spider legs, is the spider snails (Vermetidae) in the highly recognizable tropical marine shellfish. The spiral part is short, the body spiral layer (lower part of the shell) is wide and conical, the shell length is 10-25cm (up to 30, cm) slender and curved, the edge has a fine tooth-like structure (to enhance the tightness of closure), the shell surface extends downward from the top of the shell, such as "spider legs" with dense and thick ribs, dark brown or green spots between the ribs, and the overall color is mainly gray brown and brown, some individuals are light green due to the attachment of algae.

Spider snails belong to the family Molluscaceae in the order Gastropoda. 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.