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 Abdominales Linnaeus, 1758 Genus Exocoetus Linnaeus, 1758 1 Exocoetus volitans Linnaeus, 1758 - tropical two-wing flyingfish