The horned sand crab, also known as the ghost crab, ghost crab, poop crab, and sand horse crab, belongs to the phylum Arthropoda, class Soft Armor, order Decapoda, family Characidae, and genus Sand Crab in the animal kingdom. It is a marine organism. The horned sand crab is distributed in Japan, Hawaii, the South Pacific, Australia, Thailand, India, the Red Sea, the eastern and southern coasts of Africa, Taiwan, and other places. Its living environment is seawater, and it is mostly found on beaches near the high tide line in the tropical regions of the Indo Pacific. The back of the horned sand crab has a dark "H" - shaped mark. The head and chest armor of the horned sand crab is about 3 to 8 centimeters long, with a width that is about 10% longer than its length. It is slightly rectangular in shape and has a raised surface.