Pseudomelatoma moesta is a species of small sea snail, a marine gastropod mollusk in the family Pseudomelatomidae.

The shell is dark brown under an olivaceous epidermis, with about ten curved longitudinal ribs, obsoletely nodulous on the periphery, with the whorls usually slightly constricted above it.

The ribs are generally obsolete on the body whorl of adult specimens.

The suture is narrowly corded, noduled and spotted.

[2] This marine species occurs off California, USA.