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Male Ameletus oregonensis (Brown Dun) Mayfly Spinner Pictures

This mayfly was collected from Hungry Horse Creek on May 12th, 2005 and added to Troutnut.com on June 28th, 2011.

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Male Ameletus oregonensis (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana
AuthorBnewell
CameraNIKON D70
View Full SizeView Full Size (1.8X larger)
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Male Ameletus oregonensis (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana
AuthorBnewell
CameraNIKON D70
Shown Full Size
AddEmail
Male Ameletus oregonensis (Brown Dun) Mayfly Spinner from Hungry Horse Creek in Montana
AuthorBnewell
CameraNIKON D70

Recent Discussions of this Spinner

subnotatus?
Posted by GONZO on Aug 25, 2011
Might this specimen have been mislabeled? It appears to be a better match for A. subnotatus than A. oregonensis. The adult key in Zloty (1996) distinguishes A. subnotatus by the dark margins on the crossveins ("giving them a speckled appearance and forming three or four larger dark patches") and dark suffusion only at the base of the hindwing (Fig. 44B). A. oregonensis is supposed to lack the dark margins on the crossveins and have dark suffusion at the base of both the forewings and the hindwings (Fig. 44A). Table 1 in Zloty and Pritchard (1997) seems to qualify this slightly and describes oregonensis females "with brown shadings around some cross-veins but without brown patches."

McCafferty and Newell (2008) contains this record:
Ameletus subnotatus Eaton.
FLATHEAD COUNTY: Hungry Horse Creek, (A) 12-V-2005, R. Newell [FLBS]

Are these photos of that specimen?
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