Shell up to 1,75 mm in diameter, almost planispiral, spire almost perfectly flat, thin and fragile, colourless and transparent, very widely umbilicate. Periostracum very thin, smooth and colourless.
Protoconch of about 1,75 convex whorls (probably planktotrophic), diameter 230-270 µm. Tip very small and inrolled, a minute umbilicus at folding axis adapically. First 0,75 whorl delineated by a fine, straight axial groove. First 0,5 whorl sculptured with fine, crisp, densely crowded, anastomosing, vermiculate granules, thereafter perfectly smooth. Axially pleated on adapical half of adapical side immediately behind apertural rim, adapical extremity of rim finely granulate and spreading onto preceding whorl. Teleoconch of up to 2,4 slowly expanding whorls, suture channelled. Whorls with a weak or moderate shoulder angulation that marks summit of shell, with or without (through intermediates) a weak or moderate median peripheral angulation. Mode¬rately or strongly flattened between shoulder and periphery, moderately flattened on abapical half, base rounded into umbilicus. Umbilicus diameter 26-37% of shell diameter (1,15-1,75 mm). Entire surface smooth apart from obscure spiral lines and very fine collabral growth lines. Aperture elliptical. Inner and outer lips thin. Parietal lip broad and very thin.
Known distribution. Off Broken Bay, New South Wales, 439- 714 m.