Diagnosis: Shell whitish, lacking colour pattern; moderate to high, whorls rounded, tubular, not obviously shouldered; sculptured by fine spiral lirae and prosocline growth-lines, but mostly smooth and glossy; umbilical margin evenly rounded and smooth.
Description: Shell moderate to high turbiniform (L/D = 0,76-0,84), nearly conical; whorls more or less evenly rounded, tubular; periphery at mid-whorl; suture slightly sunken on early whorls, level on body whorl; not obviously shouldered; teleoconch of up to 4 whorls. Sculpture fine, comprising fine spiral lirae and growth-lines; shell glossy and smooth; spiral lirae most obvious on first whorl, ca 10 at end of whorl; lirae obsolete by end of second whorl; body whorl occasionally with traces of lirae, but mostly totally smooth; base for most part smooth, but sometimes with very weak spiral lirae near umbilicus; axial sculpture of close set, microscopic, collabral growth-lines, some larger. Umbilicus deep, of moderate width; margin evenly rounded, smooth; interior with 4-6 relatively widely spaced, fine spiral lirae. Aperture subcircular, peristome nearly complete; outer lip smooth; interior nacreous. Protoconch: Typically solarielline, diameter 460-500 µm.
Colour: Yellowish-white, no colour pattern, live-taken specimens have a pink/ green iridescence and are translucent, particularly in last half of body whorl where dark coloration of mantle tissue shows through.
Dimensions: Holotype, length 3,4 mm, diameter 4,3 mm; largest specimen, length 3,8 mm, diameter 4,9 mm.

A small species characterised by its tubular whorls and smooth, glossy white surface. Similar to I. impolita sp. n., but less elevated and lacking both colour pattern and obvious lirae. Superficially resembles Solariella tubula Dall, 1927, from the West Atlantic.

South-Africa: Known only from central and south-western Transkei, 95-500 m (living specimens 95-350 m, possibly in association with sponges).