Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Pisces nom. inval. - fishes see Class Pisces Linnaeus, 1758
           Order Chondropterygii nom. inval. see Order Nantes Linnaeus, 1758
             1 Genus Raja nom. inval. see Genus Raja Linnaeus, 1758
             2 Genus Squalus nom. inval. see Genus Squalus Linnaeus, 1758
             3 Genus Acipenser nom. inval. see Genus Acipenser Linnaeus, 1758
             4 Genus Petromyzon nom. inval. see Genus Petromyzon Linnaeus, 1758