The red clawed hand crab is an arthropod belonging to the family Tetraodontidae in the order Decapoda. The width of the head and chest armor is slightly larger than its length, square in shape, and has a smooth surface. Wide forehead, straight leading edge, sharp ridge behind forehead; The outer eye socket is triangular in shape; Sharp and toothless edges. Steps 1-4: The last 3 segments of the foot have black hard bristles; Abdominal triangle, tail segment nearly circular. Male claws are larger than females, with high palmar nodes and granular dorsal edges. The middle of the inner side has granules, while the outer side is smooth and often blood red in color; The gap between the two fingers of the male claw is larger than that of the female claw, and the inner edges of the two fingers are serrated, with one larger tooth at each end. The female abdomen is round and large.