Diagnosis: “Shell large, up to about 70 mm in width, thick
and extremely stout; 6–7 shouldered whorls, a very clear
ramp-like area on the upper portion of each whorl, generally
with prominent keels, tubercles or spines; apex obtuse;
aperture ovate; umbilicus small or absent; operculum corneous
and ovate.” (adopted from Shu et al. 2010).