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 Syngnathus Linnaeus, 1758 - pipefish Syngnathus ophidion Linnaeus, 1758 see Nerophis ophidion (C. Linnaeus, 1758)