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south end of Swan Lake Flat, Yellowstone National Park, Wyoming, USA
latitude: 44.908901
longitude: -110.730598
Precision of location: Gauged from chart or map
Site Named Here: By name of site (or city, etc.)
| coronata borealis | Jun 18, 1963 | stream at south end of Swan Lake Flat, east of road between Norris and Mammoth Springs junctions; water clear, with moderate current, 20.5 degrees C., many specimens, some of them very large (largest 25 mm long), two mature. |