eukaryotes see Domain Eukaryota Chatton, 1925
   Kingdom Protozoa Goldfuss, 1818 [paraphyletic] - protozoa
     Subkingdom Sarcomastigota Cavalier-Smith, 1983 [paraphyletic] see [unranked] dorsates Cavalier-Smith, 2021
       Phylum Choanozoa Cavalier-Smith, 1981 [paraphyletic]
         Subphylum Choanofila Cavalier-Smith, 2009 [paraphyletic] see Superkingdom Holozoa Lang, O'Kelly, Nerad, Gray & Burger, 2002
           Class Choanoflagellatea Cavalier-Smith, 1998
             Order Acanthoecida Cavalier-Smith, 1997
               Family Stephanoecidae Leadbeater, 2011
                 Genus Acanthorbis Cavalier-Smith, 2012, nom. inval. see Genus Acanthocorbis Hara & Takahashi, 1984