Johann Christoph Friedrich Klug (5 May 1775, in Berlin – 3 February 1856, in Berlin), was a German entomologist. He described the butterflies and some other insects of Upper Egypt and Arabia in Christian Gottfried Ehrenberg and Wilhelm Friedrich Hemprich's Symbolæ Physicæ (Berlin, 1829-1845). He was professor of medicine and entomology in the Humboldt-Universitat (University of Berlin) where he curated the insect collections from 1810 to 1856. At the same time he directed the Botanic Garden in Berlin which contains his collections. Klug worked mainly on Hymenoptera and Coleoptera. The plant genus Klugia (now called Rhynchoglossum, Family Gesneriaceae) was named in his honour as was the butterfly Geitoneura klugii.
In 1855, he was elected a foreign member of the Royal Swedish Academy of Sciences.
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