the root (no rank)
Eukaryota (domain)
Alveolata (kingdom)
Ciliophora (phylum)
Oligohymenophorea (class)
Peniculida (order)
Paramecium (genus)
[hide inferior taxa]
Paramecium aurelia (species)
Paramecium caudatum (species)
Paramecium jenningsi (species)
Paramecium multimicronucleatum (species)
Paramecium primaurelia (species)
Paramecium sp. (species)
Paramecium tetraurelia (species)
Paramecium triaurelia (species)