south end of Swan Lake Flat, Yellowstone National Park, Wyoming, USA
latitude: 44.908901 44°54'32.04"N
longitude: -110.730598 110°43'50.15"W
[Precision of location: gauged from chart or map]
[Site Named Here by name of site (or city, etc.)]
Polycelis (Polycelis) coronata borealis Kenk, 1953 | 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. |
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