Sirgel, W.F. (1980). Two new species of Trachycystis from South Africa (Mollusca, Gastropoda Pulmonata, Endodontidae). Zoologische Mededelingen. 55 (9): 97–113.
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Sirgel, W.F.
1980
Two new species of Trachycystis from South Africa (Mollusca, Gastropoda Pulmonata, Endodontidae).