Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987 Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838 Class Nassellaria Ehrenberg, 1847 Order Cyrtidinata Haeckel, 1862 Superfamily Eucyrtidioidea Ehrenberg, 1847 Family †Eucyrtidiellidae Takemura, 1986 [monotypic] 1 Genus †Eucyrtidiellum Baumgartner, 1984