Shell globose, with broad, rounded body whorl. Surface smooth, except for axial grooves starting from the suture and fading at some distance. Umbilicus wide, most of it occupied by a thick callus which terminates as a smooth, semicircular portion of the columella; another callus developed where the aperture meets the previous whorl. Aperture semicircular, with thin edge. Operculum calcareous, quite smooth with a narrow rim on the outer edge.
whitish with three pale, interrupted spiral bands; inside of aperture darker with continuous dark brown bands fading at some distance from the edge or the outer lip.
common size :
The large callus in the umbilicus distinguishes this species from most native naticids; the only look-alike is Natica dillwyni Payraudeau, 1826, which has a different pattern of spiral series of crescent-shaped spots on a brownish background, and lacks the subsutural folds. The related tropical Atlantic species Natica marochiensis (Gmelin, 1791), which has several unsupported Mediterranean records, differs in having a dark spire, a less a developed parietal callus, and no subsutural folds.
BIOLOGY / ECOLOGY
in the Indo-Pacific, this species lives in shallow water, in depressions lined with muddy sand, occasionally on sparse seagrass beds.