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.
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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.
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Jummbeau on Apr 21, 2008April 21st, 2008, 11:02 am EDT
Can anyone help with these two Mayflies? Both pictures were taken on June 17th, 2007 on Jam Black Brook in Appelton, Maine. The brown one is about a size 14 and the green one is about a 12/10. The brown one has 2 tais and I can't remember how many the other one had. Any assistence would be helpful.
Thank you in advance,
Jeff Space
Thank you in advance,
Jeff Space
Jummbeau on Apr 21, 2008April 21st, 2008, 11:09 am EDT
Sorry for the spelling mistakes. I guess I am not a very good proof reader.
Troutnut on Apr 21, 2008April 21st, 2008, 12:25 pm EDT
In need of some names? Ok... the top one is Lenny. The bottom one is Bob.
As for species, I think the bottom one is some species in the Siphlonurus genus (gray drakes), though I couldn't tell you which one.
The top one might be in that genus, too, but I don't remember there being a species with that coloration in the spinner's hind wing.
As for species, I think the bottom one is some species in the Siphlonurus genus (gray drakes), though I couldn't tell you which one.
The top one might be in that genus, too, but I don't remember there being a species with that coloration in the spinner's hind wing.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Troutnut and salmonid ecologist
GONZO on Apr 21, 2008April 21st, 2008, 5:52 pm EDT
Jason and Jummbeau, based on the brown hind wing, I'd guess that "Lenny" is Siphlonurus mirus.
Taxon on Apr 21, 2008April 21st, 2008, 6:15 pm EDT
Hey Gonzo, you da man.
GONZO on Apr 21, 2008April 21st, 2008, 6:28 pm EDT
Thanks, Roger. ;)
Jummbeau on Apr 23, 2008April 23rd, 2008, 9:39 am EDT
Thank you very much for your replies. Thank you also for giving me a good laugh. I made a pattern for the first mayfly, now it has a name "The Lenny".
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