eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Sarcomastigota Cavalier-Smith, 1983 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
       Infrakingdom Opizoa Cavalier-Smith, 2021 [paraphyletic]
         Phylum Choanozoa Cavalier-Smith, 1981 [paraphyletic]
           Subphylum Paramycia Cavalier-Smith, 2012 [sister group to excluded taxa] [monotypic] see Kingdom Nucleariae Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, Döring, Schigel, May, Ryberg & Abarenkov, 2018
             Class Cristidiscoidea Page, 1987 see Kingdom Nucleariae Tedersoo, Sánchez-Ramírez, Kõljalg, Bahram, Döring, Schigel, May, Ryberg & Abarenkov, 2018
               Order Fonticulida Cavalier-Smith, 1993
                 1 Genus Fonticula Worley, Raper & Hohl, 1979
                 2 Family Parvulariidae Cavalier-Smith, 2021 [monotypic]