| author | date | title | journal / publication | Kawakatsu M, Oki I, Tamura S, Sugino H | 1976 | Studies on the morphology, karyology, and taxonomy of the Japanese freshwater planarian Dugesia japonica Ichikawa et Kawakatsu, with a description of a new subspecies, Dugesia japonica ryukyuensis subspec. nov. | Bull Fuji Wom Coll 14, II: 81-126 |
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| Dugesia japonica ryukyuensis Kawakatsu, 1976 | w | primary taxonomic authority (describer) | ||
| Dugesia ryukyuensis Kawakatsu, 1976 | [with synonyms] | w | primary taxonomic authority (describer) | |
| Dugesia japonica Ichikawa & Kawakatsu, 1964 | [with synonyms] | w | other taxonomic work | |
| Dugesia japonica japonica Ichikawa & Kawakatsu, 1964 | w | other taxonomic work |