Nanomonadea is a class of biciliate phagotrophic, non-photosynthetic free-living opalozoans, containing the sole order Uniciliatida. This monophyletic group previously known as clade MAST-3 is characterized by a single hairless posterior cilium and absence of an anterior cilium.
The cladogram below shows the relationships between Nanomonadea and the rest of Opalozoans.
The taxonomy of Nanomonadea is as follows: