Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Insecta nom. inval. - insects see Class Insecta Linnaeus, 1758
           Order Aptera nom. inval. see Order Aptera Linnaeus, 1758
             Genus Monoculus nom. inval. see Genus Monoculus Linnaeus, 1758, nom. oblit.
               Apus Frisch, nom. inval. see Pulex arborescens Swam., nom. inval.