Kingdom Protista (Haeckel, 1866) - protists Phylum Ciliophora Doflein, 1901 - ciliates Class Polyhymenophorea - spirotrichs see Class Spirotrichea Bütschli, 1889 Subclass Spirotricha see Class Spirotrichea Bütschli, 1889 Order Odontostomatida Sawaya, 1940 - odontostomatids Genus Mylestoma Kahl, 1928 Genus Saprodinium Lauterborn, 1908