The shell of this species differs from that of the close azuari by its multispiral protoconch (circa 3 whorls vs. 2 in azuari). It differs from the shell of the similar species antipolitana, which has also about 3 whorls of protoconch, by the microsculpture of the latter: in andrehoaraui, the radials of the protoconch become opisthocline abapically since the second whorl, while they become prosocline on the third whorl in antipolitana.

Holotype of andrehoaraui at the Muséum National d’Histoire Naturelle of Paris, France. Data: 17m deep, Cap d’Antibes, Alpes-Maritimes, SE. France. 9,3mm. Original pictures provided by G. Duvauchelle for the MNHN – (CC BY).