(Gordon, 1947)
Carapace distinctly broader than long; rostrum short, distinctly deflexed downwards; inner supraorbital teeth low but distinct, posterior to frontal margin, folded downwards; regions defined; surfaces of carapace covered with scattered small granules. Antero-lateral and postero-lateral margins clearly demarcated; antero-lateral margin rounded, not lamelliform, with four lobes (including external orbital angle), first three lobes truncate, lined with small granules, separated by narrow fissures, tightly adjoining each other, appearing fused, lobe three very large, lower part expanded laterally, last tooth small, obscured by lobe three, confluent with first three teeth but developed, sharp, laterally directed. Antennules folding obliquely, ca. 45° from horizontal; antennular fossae oblique. Antenna free, does not fill orbital hiatus, reaching into orbit; antennal basal segment rectangular; second antennal segment short, length to width ratio of second antennal segment 1.4. Eyes well developed, filling orbit; cornea distinct, pigmented; infraorbital teeth small. Anterior surface of epistome depressed; posterior margin appears entire because of 2 fused truncate median lobes. Pterygostomial, infraorbital and subhepatic regions heavily tuberculated. Third maxilliped quadrate; ischium rectangular, median oblique sulcus shallow; merus squarish; exopod just reaches antero-external edge of merus. Sutures between sternite segments 1 and 2 indistinct, 2 and 3 distinct, shallow; between 3 and 4 interrupted medially; lateral clefts indistinct. Surface of chelipeds granular; carpus with strong sharp tooth on inner distal angle; merus and basi-ischium unarmed; chela stocky, stout, length 2 times length of fingers, height ca. 2-3 times height of fingers; fingers not carinate, pollex not bent downwards. Merus of first ambulatory leg not more slender than that of others; other segments subcylindrical; anterior margin of ambulatory meri smooth, not cristate, ends in a distinct tooth (except for the last meri). G1 not known. (Chia & Ng, 1998)
Type locality: Macclesfield Bank.
Range: Japan - Kii Peninsula (Takeda & Marumura, 1995a); Macclesfield Bank (Gordon, 1947, Chia & Ng, 1998).