Non-toxic long-arm crabs are non-toxic. But the long-arm crab has no meat and tastes worse than other sea crabs. The long-arm crab is a bow crab. The male head breastplate is oval, the female is round, the back is convex, and there are few granules, but there is no central granule ridge. You can tell the slope of the liver area. The lower liver area is prominent and visible on the back. The forehead is divided into two leaves. There is a triangular protrusion on both sides of the rear edge of the head breastplate, and a long thorn extends from the intestinal area, which is located in the center and the end is bent upward. The male head breastplate is oval, the female is round, the back is convex, and there are few granules, but there is no central granule ridge. You can tell the slope of the liver area.