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 Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758) Order Testacea Linnaeus, 1758 Genus Ostrea Linnaeus, 1758 - flat oyster Pectines auricula altera intus ciliato-spinosa Ostrea opercularis Linnaeus, 1758