January 1, 1758 (a Sunday)

Cover of the tenth edition of Linnaeus's Systema Naturae (1758).

On this date, the tenth edition of Linnaeus’s Systema Naturae was published, which is considered the starting point of zoological nomenclature; the oldest scientific names of animals accepted as valid today can be traced to this edition. Here, Linnaeus introduced the modern practice of using binomials for animal species, something he had done for plant species in the 1753 publication of Species Plantarum. Interestingly, in the first edition of Systema Naturae, the whales were erroneously classified as fishes; in the 10th edition, the whales were moved to the mammals.

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