Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Lapideum - mineral kingdom
         Class Fossilia nom. inval. - Lapides aggregati
           Order Petrificata - fossils
             Genus Entomolithus nom. inval. - fossil arthropods
               1 Entomolithus cancri nom. inval.
               1.0 Astacus petrific. nom. inval. see Entomolithus cancri nom. inval.