There is a dark part in the body of the flower nail, which is generally edible and does not do much harm to the human body. So when eating the flower nail, as long as the flower nail spits out the sand, the other parts can be eaten without any problems.

This black thing is the intestinal gland of the flower shell. Generally, there are some undigested food and some metabolic waste. But it is a kind of food that lives on the bottom of shallow sea, mainly mollusks that eat some phytoplankton and a small amount of plankton. The diet is relatively clean, and it doesn't matter if you eat it.

If you really can't eat it, you can throw it away. There is no need to eat it. At the same time, we should also pay attention to the need to clean the flower nails.