Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         [Regnum Primigenum J. Hogg, 1860 - primigenal kingdom] see Kingdom Protoctista Hogg, 1860
           [Protoctista Hogg, 1860] see Kingdom Protoctista Hogg, 1860
             1 [Protophyta] see [unranked] Protoctista Hogg, 1860
             2 [Protozoa] see Kingdom Protozoa Goldfuss, 1818