Prunum is a genus of sea snails, marine gastropod molluscs in the subfamily Pruninae of the family Marginellidae, the margin snails.

[1] The separation between the genera Prunum and Volvarina is not very precise.

The differences between these two genera are based on differences in the morphology of the shell, the radula, the radular cartilage, the mantle and the internal anatomy.

[2] A rather arbitrary criterion is currently used to distinguish between the two genera.

To date (2010) there is no phylogenetic analysis behind the current generic placements [1] Species within the genus Prunum include:[1]