For nomenclatural purposes this is the citation of the author and date of publication. A full bibliographic reference would include, in addition to the author's name and the year, the citation of the exact source of the scientific name, for example, the title of the book or journal, volume, page, etc.: Syrphus vitripennis Meigen, 1822 (Meig. Syst. Beschr. III, 308, 50).