Protoconch large, multispiral (planktotrophic larval stage), sometimes brownish, adorned of some very weak spiral striae. Whorls 8-9 white, very convex, separated from each other by a very deep suture; radial sculpture made up of 11-14 sharp lamellae per whorl, bearing a marked spiny wing below the suture; spiral sculpture almost absent, only given by very thin micro-striae, much weaker than in algerianum. Like in the latter, the radials are prosocline.