Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         Biota
           "neomura"
             Domain Eukaryota Chatton, 1925 - eukaryotes
               neokaryotes Cavalier-Smith 1993 - mitochondrial eukaryotes
                 [plesion] Class Jakobea Cavalier-Smith, 1997 [monotypic]
                   1 Order Jakobidaᵀ Cavalier-Smith, 1993