Micronuclearia

Micronuclearia is a genus of free-living protozoa. While originally thought to be a nucleariid, as reflected in the name, it is now inferred to be a member of the taxon Rigifilida, and to belong to the 'CRuMs' assemblage (whereas nucleariids are opisthokonts).
The type species is "Micronuclearia podoventralis".