This model emulates an oxyconic conch with ornamentation (sinuous and intercalar ribs). In oxycones the umbilicus is not well exposed, and the overall shell form is compressed. According to Westermann (1996) the whorl height shows pronounced expansionduring accretion of the recent 180° of shell whorl. Oxycones would have offered higher stabilityand maneuverability than other forms, and generally a short body chamber.