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Japan (Nippon, Yaponiya, Nihon, Japon, Giappone)
latitude: 36.5
longitude: 138
Precision of location: Gauged from chart or map
Site Named Here: By name of sea, gulf, or country named in source publication
| Mesostoma lingua | 1930 or earlier | |||
| Bothromesostoma personatum | 1930 or earlier | |||
| Macrostomum tuba | 1930 or earlier | lakes, ponds, and rice fields, middle Japan. | ||
| Placocephalus fuscatum | 1898 or earlier | Buitenzorg auf Java, Natuna-Inseln, überdies auch in Japan und Indien. | ||
| Strongylostoma radiatum | 1953 or earlier | |||
| Mesostoma productum | 1930 or earlier | |||
| Bothromesostoma personatum | 1929 or earlier | |||
| Rhynchoscolex simplex | 1953 or earlier | Japan. | ||
| Microstomum lineare | 1953 or earlier | Japan | ||
| Prorhynchus stagnalis | 1953 or earlier | |||
| Geocentrophora sphyrocephala | 1953 and earlier | Japan | ||
| Ozametra arbora | 1932 or earlier | fom Stichopus japonicus (Stichopodidae) | ||
| Anoplodium mediale | 1932 or earlier | from Stichopus japonicas (Stichopodidae). |