Platysympus quadranguatus Gamô, 1987

Platysympus quadranguatus Gamô, 1987: 6, figs 3–6.

Type material. Holotype: NMST, female . Allotype: NMST, subadult male. Suruga Bay, Japan, 34°34.4’N, 138°42.4’E. Not seen .

Diagnosis. Carapace with branchial swellings, with 2 pairs weak lateral ridges, in lateral view with single posterior dorsal hump. Telson 1.9 pleonite 6, 0.6 uropod peduncles, with 1 pair lateral setae. Adult male unknown.

Depth. 197–201 m.

Distribution. Suruga Bay, Japan, 34°34.4’N, 138°42.4’E.

Remarks. The carapace of Platysympus quadrangulatus is distinctive in being subrectangular in dorsal view, while other Platysympus species are oval or a truncate oval in dorsal view.