Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [[crown] organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
           [Domain Eucaryota]
             [Subdomain Chlorota Doweld (2001)]
               [Kingdom Peridiniobiota Starobogatov ex Doweld (2001)]
                 [Subkingdom Parameciobiotina Starobogatov, 1986 [monotypic]]
                   [Phylum Parameciozoaᵀ Kussakin & Drozdov, 1998]
                     [Subphylum Oxytrichozoina Doweld, 2001]
                       [Class Spathidiatea Doweld, 2001]
                         [Subclass Spathidiatineaᵀ Doweld, 2001]
                           1 [Order Buetschliida Doweld, 2001 [monotypic]]
                           2 [Order Spathidiidaᵀ Foissner & Foissner, 1988]
                           3 [Order Helicoprorodontida Grain, 1994]
                           4 [Order Amphileptida Doweld, 2001 [monotypic]]
                           5 [Order Mesodiniida Grain, 1994]