help identify this insect

[chromefinder]

Does anyone know what mayfly this is?
Picked it up off a Catskill stream this past Saturday.

 

[tomfly]

I believe that it is a Slate Drake " Isonychia bicolor also known as a Mahogany Dun"

 

[Trouser Trout]

I don't thik it is a Slate Drake, this is a Slate Drake, notice the difference in the wings.

 

[tomfly]

I don't thik it is a Slate Drake, this is a Slate Drake, notice the difference in the wings.

I defintily think it is an ISO

 

[Trouser Trout]

tomfly, i think you're right.

 

[Rusty Spinner]

It can't be an Iso, it lacks light colored legs and veination in the wings. It is also a bit short from the pix to be an Iso as well as the other two variables missing. With its tails missing, it makes identification more difficult, but it is obviously in the imago (spinner) stage. Although I haven't reached for my field guide, this mayfly is likely one of the hundreds of smaller (quantity, not size) hatches we have in our streams that often go unnoticed by both the fish and the anglers.

 

[jmoore]

Based on the scalloped hind wing (and the stubby body) it looks like a Baetisca (family Batiscidae).

Here is a link to them at troutnut.com:
http://www.troutnut.com/hatch/37/Mayfly-Baetiscidae-Armored-Mayflies

 

[sandfly]

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Pattern---Blue Dun
Body--- Dun/ Dk. Oliveish
Wing--- Dun
Legs/Hackle---Dk.Dun
Tails--- Dk. dun

 

[redietz]

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</td><td style="border: medium none rgb(236, 233, 216); width: 172pt; background-color: transparent;" width="229">

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</td><td style="border: medium none rgb(236, 233, 216); width: 213pt; background-color: transparent;" width="284">
</td></tr></tbody></table>

I don't think so. The rear wing on almost all leptophlebia/paraleptophlebia is oval/football shaped. The rear wing on this one is triangular. The Leptophlebiidae tend to be longer insects, this one is stubby.

As Rusty Spinner pointed out, lacking tails makes identification difficult.

The guess of Baetisca seems like a good one, except the fore legs are too long, I think.

 

[Taxon]

Does anyone know what mayfly this is?

Yes, I sure do. jmoore and redeitz are absolutely correct. It is a Baetisca male imago, either B. berneri or B. carolina, as they are the only Baetisca species known from PA. With regard to redeitz's concern about the length of the forelegs, the one he probably saw on TroutNut.com was a female imago. However, the male imago has greatly extended forelegs, just like those in the above photo.

Best regards,

 

[BIGBOW]

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</TD><TD style="BORDER-RIGHT: #ece9d8; BORDER-TOP: #ece9d8; BORDER-LEFT: #ece9d8; WIDTH: 172pt; BORDER-BOTTOM: #ece9d8; BACKGROUND-COLOR: transparent" width=229>


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You got allergies too? God bless you.

 

[MT319]

Size 16 Adams CDC Comparadun...all you need to know