1. Stone crabs belong to the decapod order, a family of crustaceans in the general family of stone crabs of the decapod order, which are distributed in cold seas. And the crab belongs to the decapod order short-tailed suborder of true crabs in the general family, including the pike family, hermit crabs family, and so on. Therefore, from the biological classification, there is a clear difference between the stone crab family and the crabs.

2. Species in the family Stone Crabs usually have a large body size and hard carapace, which are similar to the appearance characteristics of crabs, and their abdomens are asymmetrical, with the left side of the abdomen being larger than the right side of the abdomen, which is different from the symmetrical characteristics of the abdomen of crabs. In addition, species of the stone crab family usually inhabit cold waters, whereas crabs live mainly in tropical and temperate waters.