Kingdom Protozoa Goldfuss, 1818 - protozoa
   Subkingdom Neozoa Cavalier-Smith, 1993 see Kingdom Protozoa Goldfuss, 1818
     Infrakingdom Neomonada Cavalier-Smith, 1997
       Phylum Neomonada Cavalier-Smith, 1997
         Subphylum Mesomycetozoa Herr, Ajello, Taylor, Arseculeratne & Mendoza, 1999
           Class Mesomycetozoea Ajello & Mendoza, 2000 see Class Ichthyosporea Cavalier-Smith, 1998
             Order Ichthyophonida Cavalier-Smith, 1998
               Genus Sphaerosoma J.P. Jøstensen et al., nom. illeg. see Genus Sphaeroforma Jøstensen et al., 2002
                 Sphaerosoma arcticum J.P. Jøstensen et al. see Sphaeroforma arctica J.-P. Jøstensen et al., 2002