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 Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825
           Order Nantes Linnaeus, 1758
             Genus Squalus Linnaeus, 1758 - spiny dogfishes
               01 Squalus acanthias Linnaeus, 1758 - piked dogfish
               02 Squalus centrina Linnaeus, 1758 see Oxynotus centrina (C. Linnaeus, 1758)
               03 Squalus spinax Linnaeus, 1758 see Etmopterus spinax (Linnaeus, 1758)
               04 Squalus squatina Linnaeus, 1758 see Squatina squatina (C. Linnaeus, 1758)
               05 Squalus zygaena Linnaeus, 1758 see Sphyrna zygaena (C. Linnaeus, 1758)
               06 Squalus tiburo Linnaeus, 1758 see Sphyrna tiburo (C. Linnaeus, 1758)
               07 Squalus galeus Linnaeus, 1758 see Galeorhinus galeus (C. Linnaeus, 1758)
               08 Squalus canicula Linnaeus, 1758 see Scyliorhinus canicula (C. Linnaeus, 1758)
               09 Squalus catulus Linnaeus, 1758 see Scyliorhinus canicula (C. Linnaeus, 1758)
               10 Squalus stellaris Linnaeus, 1758 see Scyliorhinus stellaris (C. Linnaeus, 1758)
               11 Squalus glaucus Linnaeus, 1758 see Prionace glauca (C. Linnaeus, 1758)
               12 Squalus carcharias Linnaeus, 1758 see Carcharodon carcharias (C. Linnaeus, 1758)
               13 Squalus mustelus Linnaeus, 1758 see Mustelus mustelus (Linnaeus, 1758)
               14 Squalus pristis Linnaeus, 1758 see Pristis pristis (C. Linnaeus, 1758)