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Is This A BWO and If Yes, Which?

2K views 7 replies 3 participants last post by  Taxon 
#1 · (Edited by Moderator)
To the entomological brain trust,
A friend and I fished the St. Joe the last week in June and encountered a mayfly that I could use some help in identifying. In the twilight, there was a significant hatch of small (7mm, 0.25" body length) mayflies. Their bodies were mahogany colored and the fly has two tails. The latter screams BWO to me but the colors is not the olive that I am familiar with. But in Schollmeyer's "Hatch Guide for Western Streams", "reddish-brown" is an option, especially for spinners. So, I took a few pictures and have attached them for your insights.
Thanks,
Steve

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#6 ·
Slate Run-

Hmm, that line is certainly overly simplistic with regard to size. Please see below query from my website:

==================
Query Options Chosen:
==================
Search_Type="AND"
CommonName="Bluewinged Olive"
Display_sMin
Display_sMax

Family - Scientific Name - Spinner Min Len - Spinner Max Len
Baetidae - Acentrella turbida - (W): 5 mm. (E): 4 mm. - (W): 6 mm. (E): 5 mm.
Baetidae - Apobaetis futilis - 3 mm. - 3.5 mm.
Baetidae - Baetis bicaudatus - 4 mm. - 5 mm.
Baetidae - Baetis brunneicolor - 6 mm. - 10 mm.
Baetidae - Baetis flavistriga - 5 mm. - 6 mm.
Baetidae - Baetis tricaudatus - 4 mm. - 9 mm.
Baetidae - Iswaeon anoka
Baetidae - Plauditus dubius - 3 mm. - 4 mm.
Baetidae - Plauditus punctiventris - 4 mm. - 5 mm.
Baetidae - Procloeon ingens - 8 mm. - 9 mm.
Baetidae - Procloeon simile - 4 mm. - 6 mm.
Ephemerellidae - Attenella attenuata - 6 mm. - 8 mm.
Ephemerellidae - Attenella margarita - 6 mm. - 6 mm.
Ephemerellidae - Dannella lita - 9 mm. - 11 mm.
Ephemerellidae - Dannella simplex - 6 mm. - 8 mm.
Ephemerellidae - Drunella flavilinea - 7 mm. - 10 mm.
Ephemerellidae - Drunella lata - 6.5mm (male) - 8.5mm (female)
Ephemerellidae - Drunella walkeri - 8 mm. - 10 mm.
Ephemerellidae - Ephemerella dorothea dorothea - 6 mm. - 9 mm.
Ephemerellidae - Ephemerella excrucians - 5 mm. - 8 mm.

Total species/subspecies selected: 20
 
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