Anarithma stepheni is a species of sea snail, a marine gastropod mollusk in the family Mitromorphidae.
The length of the shell attains 4 mm, its diameter 1.75 mm.
(Original description) The minute, white shell is particularly beautiful. It contains six whorls, compact, clathrate, with close longitudinal riblets and revolving lirae. Just underneath the sutures the ante-penultimate and penultimate whorls are sparsely spotted with fulvous. In the body whorl the spots again occur towards the middle, but are contiguous to, and below joined with, one large dorsal effusion of the samecolour. The aperture is narrow. The simple outer lip is thickened..The columella is upright.
This marine species occurs off the Philippines; French Polynesia, Vanuatu and Papua New Guinea.
