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 Ichthyosporea Cavalier-Smith, 1998
             Order Eccrinida Léger & Dubosq, 1929 see Order Ichthyophonida Cavalier-Smith, 1998
               Suborder Sphaeroformina Cavalier-Smith, 2012
                 Family Psorospermidae Cavalier-Smith, 2012 [monotypic]
                   Genus Psorospermisᵀ Cavalier-Smith, 2012 [monotypic]
                     Psorospermis haeckeliᵀ (Hilgendorf, 1883), orth. inval.