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 Pisces Linnaeus, 1758 see Superclass Pisces Linnaeus, 1758 Order Branchiostegi Linnaeus, 1758 Genus Mormyrus Linnaeus, 1758 Mormyrus cyprinoides Linnaeus, 1758 see Marcusenius cyprinoides (Linnaeus, 1758)