Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758)
           Order Testacea Linnaeus, 1758
             Genus Trochus Linnaeus, 1758
               * Umbilicati erecti, perforata columella
               ** Imperforati erecti, umbilico clauso
               *** Turriti umbilico exserto, qui positi cadunt in latus