Most of the 17 known Atlantic species of Ammonicera have strong or evident spiral and axial sculpture on the teleoconch (Palazzi, 1988; Rolan. 1991, 1992; Simone, 1997; Bieler & Mikkelsen, 1998). Ammonicera verdensis Rolan, 1991 from the Cape Verde Islands lacks spiral sculpture, but it has some faint axial ribs near the suture at the beginning of the teleoconch and only one spiral cord on the protoconch. A. rotundata Palazzi, 1988 lacks spiral sculpture but has conspicuous axial wrinkles and few and very strong spiral cords in the protoconch.