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Karling, T. G. (1947). Studien über Kalyptorhynchien (Turbellaria). I. Die Familien Placorhynchidae und Gnathorhynchidae. Acta Zoologica Fennica. Societas pro Fauna et Flora Fennica. 50:1-64.
Karling, T. G. (1947). Studien über Kalyptorhynchien (Turbellaria). I. Die Familien Placorhynchidae und Gnathorhynchidae. Acta Zoologica Fennica. Societas pro Fauna et Flora Fennica. 50:1-64.
