| author | date | title | journal / publication | Kawakatsu M, Teshirogi W, Tokui T | 1976 | Record of a freshwater planarian, Polycelis sapporo (Ijima et Kaburaki, 1916), from the bottom of Lake Towada-Ko in North Japan, with a note on the southern limit of distribution of this species. | Physiol Ecol Japan 17:477-483 |
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