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Shikotsu-Toya National Park (Shikotsu-Doya), Japan
includes the Shikotsu-ko and Toya-ko caldera lakes. 983.3 sp km area.
latitude: 42.700001
longitude: 141
Precision of location: Gauged from chart or map
Site Named Here: By name of sea, gulf, or country named in source publication
| Dugesia japonica | 1974 or earlier | |||
| Polycelis sapporo | 1974 or earlier | |||
| Polycelis auriculata | 1974 or earlier |