Paraleptophlebia mollis nymphs habitat consists of medium flowing currents. Duns are more grayish in color, and have wider lighter stripes on it's abdomen than adoptiva. The male spinners abdomen is almost clear, while the female is dark brown. Male and female both have cream or white colored legs.

   Mature nymph species identification - P. mollis, gills of abdominal segments 3 - 5 with numerous, prominent, lateral branches, gills of abdominal segments 3 - 5 divided at a point about one third distance from base to apex of gill. Lestage 1917, Ulmer 1920, Burks - The Mayflies, or Ephemeroptera, of Illinois - 1909 reprinted 1953.