Cannabis beetles have no blood. The clam, also known as the hairy clam, belongs to shellfish in seafood. The shell is thick and oval, usually the two shells are different in size, and the right shell is slightly smaller. The dorsal end is slightly angular, the front end of the abdominal edge is round, and the rear end is slightly extended. The tops of the shells protrude inward and curl forward, and the tops of the two shells are not far apart. There are about 35 radial ribs on the shell surface, and there are square knots on the ribs, which are like tiles. The growth line on the ventral side is very obvious. The shell is white and covered with brown fluff shell. The shell is white, and the edge of the shell has teeth. Hinges are narrow, straight and have fine teeth.