Habitat: Rocky rubble, oyster reefs and other shallow sub-tidal and inter-tidal habitats. Distribution: This species has been reported from the eastern Pacific, from the Gulf of California to Peru. In the Atlantic, it is found in tropical western Africa, Ascension Island, Bermuda, the Bahamas, throughout the Gulf of Mexico, the West Indies and Caribbean, and South America to southern Brazil. Natural History Notes: The larval development: eggs hatch and metamorphose through two zoeal stages and one megalopal stage before becoming juveniles. Characteristics: This crab species has a maximum body width of 12 to 14 mm. The female is generally much smaller, between 3 and 4 mm body width. The color pattern for the adults consists of an orange-brown to dark brown background. Mature specimens of both sexes may show varying amounts of brilliant blue pigmentation on some portion of the mouthparts.