• Cellular forms
• Domain: Eukaryota
• Kingdom: Animalia
• Subkingdom: Monocytozoa or Protozoa
• Phyllum: Ciliophora
• Class: Oligohymenophorea

• Order: Peniculida
• Order: Hymenostomatida
• Astomatida
• Sessilida
• Mobilida
• Order: Philasterida
• Order: Pleuronematida