Vacerrena nana is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.

The rather solid shel is elevated-conic.

It is sculptured with 15 radiating ribs, the front ones wider apart.

The apex is acute and strongly recurved.

[2] This marine species occurs in the Red Sea.