Nobili, 1906
The carapace is somewhat broader than long and is slightly depressed; its upper surface is frosted with fine granules and covered with numerous tubercles, which become larger toward the antero-lateral and frontal margins.
The front is relatively wide and divided into two lobes, the inner angle of each lobe is marked by a tubercle. The posterior margin is slightly convex and is beaded with tubercles of smaller size. The pterygostomial regions are somewhat protuberant and are tuberculated. The orbits are completely shut off from the antennulary fossae, the infraorbital lobe being in close contact with the edge of the front; the second segment of antenna, which is immovably fused with the infraorbital lobe, is also confined within the antennulary fossa.
The exopodite of the external maxillipeds is armed with two or three tubercles; the merus and ischium are also armed with a tubercle.
The chelipeds are not very stout and long. The arm has a long conical tubercle near the distal extremity of the anterior border, and three or four such tubercles on the posterior border and one or two on the upper surface near the distal end. The wrist and palm with a few tubercles on the upper surface, the latter segment is inflated in the middle. The fingers are distinctly slender and curved. The merus of the ambulatory legs has two or three conical tubercles on the anterior border; in the full-grown specimen, the carpus and propodus also have a tubercle on the anterior border. The dactylus is hooked at the tip.
The abdomen of the female consists of five segments. (Sakai, 1937)
Type locality: Tuamotu Archipelago.
Range: Japan - Shimoda and Tosa Okinoshima (Sakai, 1937a), Amakusa (Miyake et al., 1962), Sagami Bay (Sakai, 1965b), Sagami Bay, Izu Peninsula, Kii Nagashima, Tosa Bay, Amami-Oshima (Sakai, 1976a), Shiono-misaki (Miyake, 1983), Kakeroma-jima near Amami-Oshima (Takeda, 1989); Palau (Takeda, 1973d); Indonesia - Timor (Ihle, 1918); Tahiti; Tuamotu Archipelago - (Nobili, 1906), Fakarava (Rathbun, 1907).