Rathbun, 1906
Diagnosis:
Inner orbital margin evenly tuberculate with 3 or 4 rounded tubercles. Lobe of inner orbital angle not touching outer one. Grooves of carapace rather indistinct. Gastric tooth not distinguishable from other tubercles of the area.
Lateral margin of carapace with a cervical incision only. Anterior margin of carapace between the eye and anterolateral angle convex. First abdominal somite with only two red spots (laterals), median spot absent. Median carinae on abdominal somites hardly noticeable. Outline of the posterior margin of the pleura of the second abdominal somite evenly convex.
Type:
Type locality: "Bahia, Brazil". Holotype female in USNM, no. 21612.
Geographical Distribution:
Western Atlantic region: Brazil (from Maranhão State to Bahia State). There is also a record from Dominica in the West Indies.
Habitat and Biology:
Depth range from 22 to 38 m. Very little is known about this species.
Size:
Total body length to about 20 cm; carapace lengths 7.5 to 10 cm.
Interest to Fisheries:
Fausto Filho et al. (1966) remarked that the species is of "alguma importancia econômica" in northern Brazil.