The blood clam, also known as mud clam and flower clam, is a shellfish marine creature. It is also known as the flower clam or the western clam, and is a delicacy for the table. Yongjia field traditional banquet "eight plate eight" in the blood clams for cold dishes. Its meat purple-red, the edge of the meat has a golden thread like color, taste extremely delicious, hobbyists, as a delicacy under the wine. Because of its juice such as blood color, so the name.