头足类动物系软体动物之一纲。目前世界上被发现的软体动物约有8万余种,在我国近海的软体动物约有3千余种,其中海生头足纲软体动物数量虽不多,但药用价值却很大。头足类软体动物的身体左右相称,常见种类缺少外壳,头部显著,两侧有一对发达的眼,其足环生于头部的前方。根据其口部周围的腕有十足腕或八足腕之不同,成为其 A class of cephalopods molluscs. At present, there are about 80,000 species of molluscs found in the world. There are about 3,000 species of mollusks in the offshore of China. The number of marine cephalopod mollusks is not large, but their medicinal value is very large. The body of the cephalopod molluscs is commensurate with the left and right sides. Common species lack a shell and the head is prominent. There are pairs of developed eyes on both sides, and the foot ring is born in front of the head. According to the wrist around the mouth, there is a difference in the full wrist or eight-legged wrist, becoming