Gastric and pregastric teeth hardly noticeable, forming only faint broad elevations. No median carinae on the abdomen. Carpus of the first pereiopod with a distinct dorsal groove, and without a conspicuous basal swelling. First somite of the abdomen with 2 distinct lateral spots, between which numerous small spots are present, which in the median area are somewhat fused. Outline of pleura of second abdominal somite broadly rounded. Fourth abdominal somite of adult specimen not conspicuously higher than the third.
Type locality: "Post Office Bay, Charles Island, Galapagos Archipelago". Holotype male in USNM, no. 104557.
Eastern Pacific: Gulf of California, Mexico; Galápagos Archipelago, Ecuador. A larva probably of this species, at 200 miles N. of Clipperton Island.
Habitat and Biology:
In shallow water, around 10 m; hardly any accurate depths are known. Probably on rocky substrate. Nocturnal.
Total length up to about 25 cm; carapace length from 8 to 12 cm.
Interest to Fisheries:
There is no special fishery for this species, but animals are occasionally caught in traps and trammel nets for spiny lobsters or other species. When caught the animals are used for food. Also the aquarium trade showed interest in this species, but it is caught too infrequently to be of economic importance.