Shell glassy, translucent, with spire weakly convex. Protoconch of 1_ whorls, with well-defined junction to teleoconch. Teleoconch of 6-7 whorls; early whorls moderately angled at top and bottom, latter whorls rounded. Sculpture clathrate; axial sculpture of narrow ribs, 16-23 on second-last whorl, crossed by finer spiral cords forming beads at intersections; 4-6 spirals on second-last whorl. Aperture lens or D-shaped, with broad anterior canal and narrow posterior canal; outer lip greatly thickened externally; inner lip callused, thickened at top and bottom. Colour translucent white, becoming opaque with age.
Size: Up to 6.9 mm in length.
https://seashellsofnsw.org.au/Rissoidae/Pages/Rissoina_(Phosinella)_allanae.htm
