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A new species of freshwater crab,    Potamonautes   danielsi    sp. n. , is described from the southern region of the KwaZulu-Natal Province, South Africa.    Potamonautes   danielsi    most closely resembles    P.   sidneyi    which is re-described here, but can be distinguished by a suite of key morphological characters including carapace shape and width, slim pereopods, inflated propodi of the chelipeds, and the shape and terminal segment length:subterminal segment length ratio of the 1 st  gonopod. In a previous study ( Gouws et al. 2015 ), a 9.2–11.8 % divergence was found in the mitochondrial COI and 16S genes of the    P.   sidneyi    clade, allowing for the delineation of a new species. Despite the clear molecular distinction between the two species, it is difficult to separate them based on individual morphological characters, as there is a great deal of overlap even among key features. The new species is found in slow-moving mountain streams and pools at high altitudes between Umhlanga and Mtamvuna, in KwaZulu-Natal.

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Redescription of    Potamonautes   sidneyi    (Rathbun, 1904) (  Decapoda  ,   Potamonautidae  ) and description of a new congeneric species from KwaZulu-Natal, South Africa