(Rathbun, 1916)
Carapace with tubercles in midline; hepatic and epibranchial margins surmounted by globular lobes; branchial regions not swollen; antero-lateral margin of branchial region with a flattened plate; cardiac region with a tubercle or low, flat islet; ambulatory meri cylindrical, lacking carinae. (Davie 1996)
Type locality: Apo Island, between Negros and Siquijor, Philippines, 9°15'45"N, 123°22'00"E, "Albatross" stn 5536, 505 m.
Range: Japan - south of Satsuma and Koshiki-jima (Yokoya, 1933), off Mikawa Bay and Tosa Bay (Sakai, 1976a), Bono-misaki (Griffin & Tranter, 1986a), Koshiki-jima (Miyake, 1983); Philippines - between Negros and Siquijor (Rathbun, 1916, Griffin, 1976), Leyte and north Mindanao (Griffin, 1976); 120-440 m.