This is one of the two most common species of Rhithrogena. Where & WhenRegion: West
» Species undulata (Small Western Red Quill)
Time Of Year (?): Mid-June through August
Hatching BehaviorRhithrogena undulata duns escape their nymphal shucks (Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.) underwater, but instead of emerging on the stream bed like most Rhithrogena species, they wait until they are within inches of the surface.
Swisher and Richards in Selective Trout say the duns are unimportant.Spinner Behavior
Time Of Day: DuskKnopp and Cormier call the spinner falls of Rhithrogena undulata "spectacular," and others mention that they are fishable.Nymph Biology
Current Speed: Slow to mediumThese nymphs prefer slower water than the others in their genus.
Pictures of 2 Mayfly Specimens in the Species Rhithrogena undulata:
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