Ciliophora

Cladus: Eukaryota
Regnum: Chromalveolata
Infraregnum: Alveolata
Phylum: Ciliophora
Subphyla: Postciliodesmatophora - Intramacronucleata
Reference

Thomas Cavalier-Smith, Protist phylogeny and the high-level classification of Protozoa, Europ. J. Protistol. 39, 338-348 (2003).bhal

Alternative classifications
Honigberg et al. (1964)

In Phylum Protozoa
Subphylum Ciliophora
Class Ciliatea

Subclass Holotrichia
Subclass Peritrichia
Subclass Suctoria
Subclass Spirotrichia

John O. Corliss (1984)

From The kingdom Protista and its 45 phyla

In Kingdom Protista
Assemblage "Ciliates"
Phylum Ciliophora Doflein, 1901

Cavalier-Smith (1993)

From Kingdom Protozoa and its 18 phyla

In Kingdom Protozoa, Subkingdom Dictyozoa, Branch Bikonta, Infrakingdom Neozoa, Parvkingdom Alveolata
Superphylum Heterokaryota Hickson, 1903 stat. nov.
Phylum Ciliophora Doflein, 1901 stat. nov. Copeland, 1956 emend. auct.

Class Spirotrichea
Class Prostomatea
Class Litostomatea
Class Phyllopharyngea
Class Nassophorea
Class Oligohymenophorea
Class Colpodea
Class Karyorelictea

de Puytorac (1994)

Phylum Ciliophora Doflein, 1903

Subphylum Tubulicorticata
Subphylum Filicorticata
Subphylum Epiplasmata

Cavalier-Smith (1998)

From A revised six-kingdom system of life

In Kingdom Protozoa, Subkingdom Neozoa, Infrakingdom Alveolata
Superphylum Heterokaryota Hickson 1903 stat. nov. Cavalier-Smith 1993
Phylum Ciliophora Doflein 1901 stat. nov. Copeland 1956 em. auct.
References

2011: Zootaxa, 3048: 62–68. Preview