Platysympus ovalis Gamô, 1987

Platysympus ovalis Gamô, 1987: 2, figs 1–2.

Type material. Holotype: NSMT, female . Paratype: NSMT, female. Suruga Bay, Japan, 34°42’– 34°43.3’N, 138°47’7”– 138°41.6’E. Not seen .

Diagnosis. Carapace with branchial swellings, with 3 pairs weak ridges, in lateral view without dorsal humps. Telson 1.6 pleonite 6, 0.5 uropod peduncles, without lateral setae. Adult male unknown.

Depth. 367–375 m.

Distribution. Suruga Bay, Japan, 34°42’– 34°43.3’N, 138°47’7”– 138°41.6’E.

Remarks. This species is similar to the other Japanese species, Platysympus japonicus and P. muranoi, but can be differentiated by the longer telson and the carapace in lateral view. In both P. japonicus and P. muranoi the telson is less than 0.5 the uropod peduncle length and the carapace has a distinct hump at the posterior edge, while in P. ovalis the telson is longer than 0.5 the uropod peduncle length and the carapace does not have a distinct hump at the posterior edge.