FIGURE 4. Ammonicera sleursi sp. nov. A–B. Holotype, apical views; A. General view; B. Detail of the protoconch (interpreted boundary between protoconch and teleoconch at arrowhead); C–D. Paratype 1, umbilical views; C. General view; D. Detail of the protoconch; E and G. Paratype 3; E. Dorsal view; G. Apical view, showing coloration; F. Paratype 2, apertural view; H. Specimen from Los Arcos (LACM 71-83), apical view showing wide grooves between spiral cords. Scale bars: A, C, E–G = 0.2 mm; B, D, H = 0.1 mm.