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 Ostracion Linnaeus, 1758 Ostracion tricornis Linnaeus, 1758 see Acanthostracion quadricornis (C. Linnaeus, 1758)