Nominotypical ( Japan) morph

Figs 2 (as Japan), 4A–D

Material examined

Three sequenced specimens (Table 1).

Remarks

Morph with a single identified haplotype (Fig. 3).

Shell broad-fusiform (SL up to 53 mm, holotype 50 mm) dark-coloured, with chestnut-brown primary callus and well-defined light purplish secondary callus (Fig. 4 A–D). Body cloak orange-brown. Olivoid band light yellowish. Upper anterior band strongly convex, of same colour as body whorl cloak, lower anterior band much lighter, yellowish. Plication plate white, with 3–4 indistinct to nearly obsolete plicae. First protoconch whorl diameter 0.8–0.92 mm (mean 0.88, n=3). Depth range 150–350 m (Tsuchida 2017), sequenced specimens from 230– 280 m.