FIG. 7 in Quaternary and Recent shells of Ocenebra erinaceus (Linnaeus, 1758) and O. brevirobusta Houart, 2000 (Mollusca, Muricidae, Ocenebrinae): reflections on the intra- and interspecific variations

FIG. 7. — Simplistic representation of the ontogeny of the spiral cords of Ocenebra brevirobusta Houart, 2000 (population from Casablanca, Moroccan Atlantic). Abbreviations: adis, adapical secondary cord of the siphonal canal; ADP, adapical primary cord of the siphonal canal; ads, adapical secondary cord of the sutural ramp; IP, infrasutural primary cord; P1, shoulder cord; P2-P6, primary cords of the convex part of the whorl (w.); s2, s3, s6, secondary cords of the convex part of the whorl.