[2] Although previously suggested as a subgenus of Diloma,[3] genetic analysis has shown it to be more appropriate as its own genus.

The concave columella is arcuate, thin-edged, perfectly simple and curved below.

It is above spread over the umbilical area as a rounded, well-defined pad of callus.

from the Northern Cape, Noup, diameter 18.0 mm (HVDBM185-10, NMSA W7608); the colour pattern suggests Oxystele impervia, but they group with Oxystele variegata These marine species occur off South Africa and Japan.

Phylogram (weighted maximum parsimony based on 16S, COI and actin sequence data) of the species in the genus Oxystele:[4] O. tigrina (Anton, 1839)[6] O. sinensis (Gmelin, 1791)[7] O. tabularis (Krauss, 1848)[8] O. impervia (Menke, 1843)[9] O. antoni (Anton, 1839)[10] Other species in the genus not included in this tree are: Species brought into synonymy: