Superclass Spirotricha Bütschli, 1889 see Class Spirotrichea Bütschli, 1889 Class Oligotrichea Bütschli, 1889 see Subclass Oligotrichia Bütschli, 1889 Subclass Oligotrichia Bütschli, 1889 1 Order Choreotrichida Small & Lynn, 1985 2 Order Oligotrichida Bütschli, 1889 see Subclass Oligotrichia Bütschli, 1889