(Sakai, 1939)
Antero-lateral lobes well defined, more-or-less prominent, and all clearly and broadly separated; front markedly produced beyond the general carapace outline, a distinct median incision separating two lobes with their margins laterally sloping; 2M anteriorly divided. (Davie, 1997)
Type locality: Misaki, Sagami Bay, Japan.
Range: Japan - Misaki (Sakai, 1939), Sagami Bay (Sakai, 1965b), Sagami Bay, Kii Minabe, and Tosa Bay (Sakai, 1976a); Taiwan; Philippines - Legaspi Light, east coast of Luzon, and Jolo (Garth & Kim, 1983).