Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
Featured on the forum
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and
fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or
support the project for an enhanced experience here.
Female Baetidae (Blue-Winged Olive) Mayfly Spinner Pictures
This species is probably in Centroptilum, Cloeon, or Procloeon. I captured this spinner on the same night as a dun which is probably of the same species.
This mayfly was collected from the West Branch of Owego Creek in New York on August 9th, 2006 and added to Troutnut.com by Troutnut on August 11th, 2006.
Discussions of this Spinner
No Help
Posted by Taxon on Aug 11, 2006
Last reply on Aug 11, 2006 by Taxon
Jason-
The single detached intercalaries in the fore wing would limit the choices to the genera you suggest. The sharply pointed costal projection and single longitudinal vein in the hind wing probably narrow it to a single species. Unfortunately, none of the Baetidae hind wing illustrations to which I have access show either that sharply pointed of a projection or the single longitudinal vein, let alone in combination with one another.
The single detached intercalaries in the fore wing would limit the choices to the genera you suggest. The sharply pointed costal projection and single longitudinal vein in the hind wing probably narrow it to a single species. Unfortunately, none of the Baetidae hind wing illustrations to which I have access show either that sharply pointed of a projection or the single longitudinal vein, let alone in combination with one another.
Anyone want to weigh on on the ID here?
Posted by Troutnut on Aug 11, 2006
Last reply on Aug 11, 2006 by Troutnut
I can't follow the key in Merritt & Cummins very far since it's not a male spinner. The sharp costal process could be a good hint. Anybody know which genus or species this is?
Start a Discussion of Spinner
Female Baetidae (Blue-Winged Olive) Mayfly Spinner Pictures
Collection details
Location: West Branch of Owego Creek, New York
Date: August 9th, 2006
Added to site: August 11th, 2006
Author: Troutnut
Date: August 9th, 2006
Added to site: August 11th, 2006
Author: Troutnut