| author | date | title | journal / publication | den Hartog C | 1968 | An analysis of the Gnathorhynchidae (Neorhabdocoela, Turbellaria) and the position of Psittacorhynchus Verweyi nov. gen. nov. sp. in this family. | Koninkl Nederl Akad Van Wetenschappen 71:335-345 |
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