A new species of the genus Phyllhermannia is described from soil of Golden Gate Highlands National Park (central South Africa), based on all ontogenetic instars. The species is also recorded in Lesotho. Adult of Phyllhermannia goldengatensissp. nov. differs from P. africana, P. natalensis, P. nathanaeli, and P. pauliani by the presence of median longitudinal and three pairs of lateral semicircular band-like furrows resembling the shape of large cells on dorsal part of the notogaster. The juvenile instars of P. goldengatensissp. nov. are compared with those P. bandabanda, P. falklandica, P. gladiata, P. lemannae, and P. sauli. An identification key to known species of Phyllhermannia in South Africa is presented.