This is primarily a Western genus. Cinygmula ramaleyi is the most important species, producing good hatches in the West. Cinygmula reticulata may also be relevant, and I have seen a great spinner swarm from an unsung species, Cinygmula par, in the Washington Cascades.
» Genus Cinygmula (Dark Red Quills)
(Cinygmula gartrelli, Cinygmula kootenai, Cinygmula tarda, Cinygmula tioga, Cinygmula uniformis)
There is only one Eastern species, Cinygmula subaequalis, and its importance is minor. Where & WhenI have found different Cinygmula species emerging throughout the summer and fall in Washington and Alaska.Hatching BehaviorMost Cinygmula duns emerge in the surface film, but in some cases they may 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.) while still drifting to the surface.Spinner BehaviorThe angling literature suggests that Cinygmula spinner falls are too sporadic to be important, but I have seen Cinygmula par swarming in very good numbers, albeit on a small stream where hatch-matching wasn't needed because the hungry trout would hit anything anyway.Nymph BiologyCinygmula nymphs can withstand slower water than many of the other genera in the Heptageniidae family.
Pictures of 35 Mayfly Specimens in the Genus Cinygmula:
Recent Discussions of Cinygmula
Red Heptagenia? 30 Replies »
Posted by GONZO
on Jul 19, 2011
The gills and protruding mouthparts make me think that this might be Cinygmula. I've seen red phase Rhithrogena nymphs, but have never seen this coloration in Cinygmula (or Heptagenia).Reply
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