A Red-brown to purple carapace with a spine-tipped edge on the front half; contains ten small teeth on the anterolateral margins; tenth tooth is the most prominent. There are no teeth on the posterolateral margins. Width of carapace up to 23 cm. Chelipeds are purple to brownish at the base and the hands are white with purple. The carpus, propodus, and dactyl of the chelae have spiny ridges. This species alone accounts for more than 99 percent of all crab species taken for commercial reasons.