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Josef Redtenbacher (27 March 1856 – 18 July 1926) was an Austrian entomologist and teacher. He specialized in the orders of Orthoptera (grasshoppers, locusts, and crickets), Phasmatodea (stick and leaf insects), Mantodea (mantis) and Blattodea (cockroaches), which are classically summarized as Orthoptera, as well as in the earwigs (Dermaptera), which are not assigned to the Orthoptera, especially from Austria-Hungary and Germany.