Quinnia is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the subfamily Seguenziinae of the family Seguenziidae.

It has a peripheral carina and sharp, collabral axial riblets.

All whorls possess midwhorl angulation.

The anterolateral sinus forms a channel.

Radula: the rachidian tooth is higher than broad and has lateral wings reduced or absent.