Sadoga-shima (Sado, Sado-ga-shima, Sadogashima) Island, Japan
latitude: 38     38°0'0"N
longitude: 138.416702     138°25'0.13"E
[Precision of location: Alexandria Digital Library (with NGA GNDB data)] 
[Site Named Here by name of island, bay, strait, lake, river, or stream, etc., named in source publication] 
| Dugesia japonica Ichikawa & Kawakatsu, 1964 | 1974 or earlier | Sadogashima Island on the Sea of Japan. | ||
| Phagocata vivida (Ijima & Kaburaki, 1916) | 1974 or earlier | 
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