Grobler 1994. Species of the genus Zygoribatula Berlese, 1916 (Acari, Oribatida, Oribatulidae) from South Africa 3. Zygoribatula contracta spec. nov. and Zygoribatula setosa Evans, 1953. Navorsinge van die Nasionale Museum (Bloemfontein), 10(6), June 1994: 261-279