| author | date | title | journal / publication | Kawakatsu M, Oki I, Tamura S | 1995 | Taxonomy and geographical distribution of Dugesia japonica and D. ryukyuensis in the Far East. | Hydrobiologia 305:55-61 |
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| Dugesia japonica ryukyuensis Kawakatsu, 1976 | w | latest taxonomic authority | ||
| Dugesia ryukyuensis Kawakatsu, 1976 | [with synonyms] | w | latest taxonomic authority |