Sea cucumber has no thorns, because it belongs to ginseng. Sea cucumber is generally divided into Stichopus japonicus and Stichopus japonicus. What we usually see is Stichopus japonicus, and those without Stichopus japonicus are generally light ginseng. Many imported sea cucumbers are also light ginseng without thorns. Glossy ginseng, also called sea eggplant, is produced in Nanhai, Kansai and other places in China.

Stichopus japonicus is commonly known as "sand _". Sea cucumber, Stichopidae. Body length is 20-40 cm. Soft, cylindrical, dark brown, tan or gray. The back is convex with 4-6 irregular conical thorns of different sizes. The ventral surface is flat, and three rows of tubes are densely covered. The mouth is located at the front end, and there are 20 tentacles around the mouth. The bones in the body wall degenerate into tiny bone fragments. I like living under rocks or seaweed and doing slow exercise. Have the habit of sleeping in summer.

Ginseng is a kind of sea cucumber. The body surface is black and spineless, round, with thick skin and thin flesh. Mainly distributed in northern Europe and the east coast of North America.