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The scorpion fauna of southern Africa is very diverse, especially in the arid western half of the subcontinent. New species continue to be discovered as the region is surveyed with ultraviolet light detection methods. The present contribution describes Uroplectes ansiedippenaarae sp. n., which is endemic to the Succulent Karoo Biome in the Northern Cape and Western Cape provinces of South Africa. The new species appears to be most closely related to U. variegatus (C.L. Koch, 1844), which is endemic to the Fynbos Biome in the Western Cape Province. Uroplectes ansiedippenaarae sp. n. is the smallest species of Uroplectes Peters, 1861, and among the smallest scorpion species in southern Africa, with adults ranging from 16-20 mm in total length. The addition of this new species raises the number of Uroplectes species and subspecies in South Africa to 19, and the number of endemics to 10.