Finlay described the species as follows: Shell [subulate, highly polished, milk-white], but smaller, more inflated, and less slender [than Onoba lactea].

Outer lip and varix not nearly so crass as in last species, aperture suboval, less emarginate below.

Umbilicus about same size, but less prominent, due to absence of encircling blunt angulation and rounder base.

Nearly related to [Haurakia semireticulata], but shorter, with weaker peripheral thread and umbilicus.

[1] The holotype was collected from the Mount Harris Formation near Pukeuri, Otago, which dates to the early Miocene era.