Extranuclear inheritance occurs in : -

In killer strains of Paramecium aurelia, the killer trait is due to kappa particles, which are present in the cytoplasm (they are symbiotic bacteria).
Kappa particles produce a toxin (paramecin) that kills sensitive strains. They are inherited through the cytoplasm, not through nuclear genes, though a nuclear gene K is needed to maintain them (studied by Sonneborn).
So extranuclear (cytoplasmic) inheritance occurs in killer Paramecium.