Rieger, R. M. (1977). The relationship of character variability and morphological complexity in copulatory structures of Turbellaria-Macrostomida and -Haplopharyngida. Mikrofauna des Meeresbodens, 61: 197-216
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Rieger, R. M.
1977
The relationship of character variability and morphological complexity in copulatory structures of Turbellaria-Macrostomida and -Haplopharyngida