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Mayfly Species Rhithrogena undulata (Small Western Red Quill)

This is one of the two most common species of Rhithrogena.  

Where & When


Region: West

Time Of Year (?): Mid-June through August


Hatching Behavior


Rhithrogena undulata duns escape their nymphal shucks (
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
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: Dusk

Knopp and Cormier call the spinner falls of Rhithrogena undulata "spectacular," and others mention that they are fishable.

Nymph Biology


Current Speed: Slow to medium

These nymphs prefer slower water than the others in their genus.

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