AbstractA new species of the freshwater crab genus PotamonautesMacLeay, 1838 from Mporokoso, northern Zambia, southern Africa is described. Potamonautes caputanatisn. sp. is morphologically distinct from other species of this genus found in Zambia and its neighboring countries. The new species is recognised by a unique combination of morphological characters of the carapace, thoracic sternum, major cheliped, and adult male first gonopod. Illustrations of P. caputanatisn. sp. are provided and differences with congeners found elsewhere in Zambia and southern Africa are discussed. The addition of P. caputanatis n. sp. raises the number of species of freshwater crabs known to occur in Zambia to eleven. An updated checklist and key are provided to the Zambian species of freshwater crabs.