Phylum [Choanozoa] Cavalier-Smith, 1981 Class Mesomycetozoea Ajello & Mendoza, 2000 see Class Ichthyosporea Cavalier-Smith, 1998 Order Ichthyophonida Cavalier-Smith, 1998 Genus Sphaeroforma Jøstensen et al., 2002 Sphaeroforma arctica J.-P. Jøstensen et al., 2002