Diagnosis: Shell of moderate height, whorls rounded and lacking a shoulder; sculptured by growth-lines and faint spiral lirae, surface glossy; umbilical margin rounded. Mottled brown on apical surface, periphery boldly spotted, base white.
Description: Shell of moderate height (L/D = 0,67-0,77); spire prominent, slightly cyrtoconoid; whorls rounded, lacking a shoulder; periphery just below mid-whorl, base slightly flattened; teleoconch of up to 4,5 whorls. Sculpture weak, shell glossy; first whorl with ca 8 indistinct spiral lirae, becoming more numerous on subsequent whorls, but very variable in number (10-30 above periphery of body whorl); from end of second whorl on they appear as striae rather than lirae; spiral sculpture weaker at periphery and almost totally absent on base; whole shell with very fine, irregularly spaced, curved, prosocline growth-lines. Umbilicus deep, relatively narrow; margin evenly rounded, without pliculae; interior with up to 15 fine spiral lirae. Aperture subcircular, upper half slightly flat-sided and angular where outer lip meets parietal lip; outer lip smooth; peristome incomplete; interior nacreous. Protoconch: Typically solarielline, diameter 460-500 µm.
Colour: Ground colour white to yellowish-white; colour pattern develops mainly during third whorl; typically with a broad spiral band of more or less uniform light brown to brownish-orange approximately midway between suture and periphery; between this and adapical suture blotches of ground colour show through giving an alternating brown and white band; area from uniform band to and including periphery bears bold, widely spaced brownish-orange to dark brown blotches; base and umbilicus lack colour pattern. Protoconch white to yellowish-white. Dimensions: Holotype, length 6,6 mm, diameter 8,6 mm (= largest specimen).

Somewhat similar to I. laevissima, but smaller, with a higher spire, and with weak but distinct spiral sculpture on most of adapical surface. The colour pattern of bold peripheral blotches is characteristic, but not unique to this species.

South Africa: Natal south coast to south-western Transkei (living specimens 196-300 m).