Platysympus japonicus Gamô, 1975

Platysympus japonicus Gamô, 1975: 229–235, figs 1–2.

Type material. Holotype: NSMT, adult female. Sagami Bay, Japan, 34°44.8’N, 139°8.5’E. Not seen.

Diagnosis. Carapace with branchial swellings, with 1 pair ridges, in lateral view with single dorsal hump at posterior margin. Telson 2.1 pleonite 6, 0.5 uropod peduncles, without lateral setae. Adult male unknown.

Depth. 480 m.

Distribution. Sagami Bay, Japan, 34°44.8’N, 139°8.5’E.

Remarks. The most similar species are Platysympus typicus and P. depressus . In P. depressus and P. typicus the telson is longer than 0.5 the uropod peduncle length, while in P. japonicus the telson is less than 0.5 uropod peduncle length.