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Cream Cahill - Maccafferitium Interpuncatatum
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This mayfly photograph was on the Little J at about 4:00 pm on May 20th. Pretty certain body was about 8-10mm.

Again, those just going thru the process for the first times here are some of the key indicators in identifying mayflies. Pcray1231 and sandfly have been real helpful here in this forum and are really good at this. Most of us go back to the books to verify many of the bugs we see, especially this year with hatches coing in so early. I was out with a few guys the other week, each with decades of experience and none of us called it right on the stream. Still need to look it up to get it right.

This one isn't easy, but give it a go to fill out as much data as you see and identify the mayfly.

Tails: 2 or 3
Fore wings: solid color or molted/spotted coloring
Hind wing: absent, obvious or minute (small nub behind fore wing)
Body length:
Hind wing costal bump: present or absent
Flat head: yes or no
Time of day:
Date:
Body Color:

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Posted on: 2012/4/17 20:03

Edited by dkile on 2012/4/17 21:01:10
Edited by Maurice on 2012/4/29 11:54:35
Edited by Maurice on 2012/4/29 11:55:29


Re: One from last year
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Female Cream Cahill - Maccaffertium mediopunctatum

Posted on: 2012/4/17 20:45
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Re: One from last year

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haha, I think Maurice missed the point.

I'll be the first to admit I struggle to get beyond the genus. This is a maccaffertium genus. That fits all the cahills and march browns, they are closely related. I think Maurice is right on species, but am less sure of that. It wouldn't shock me if someone told me it was a March Brown, in fact, I started a thread where I misidentified a cahill and called it a March Brown. Sandfly corrected me.

2 tails, mottled wings, large/obvious hind wing.

Which kind of brings up another point. There's quite a few genus's that fit this description! Another marker to throw in there is the barred legs. I wish I had a nice list of which genus's/species have it and which ones don't. But I do know that it's pretty much on all in the maccaffertium genus, and it's also a very common genus in PA. Thus, when I see the 2 tails, mottled wings, and large hind wing, then barred legs, I usually check if it fits in maccafertium and rarely have to go beyond that.

Anyway, between march brown and light cahill, anyone have any "hard" biological markers? Generally, the cahills have more of a yellowish tint in the body, wing and tails, whereas March Browns are more brownish. But there's so much variation in color between individuals, it's not a reliable marker.

Posted on: 2012/4/17 21:03


Re: One from last year
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Actually I got straight to the point. I will leave the over-analyzation (pun intended) to the fast typists.

I agree though; my indicators were: two tails, Mottled wings, barred legs. Color less brown, more yellow/cream sent me to cahill (maccaffertium/old stenonema). Had to go to trout nut to get the species.

As for biological markers, meh.....March Browns are typically a week or more before the cahills and a size smaller. So it usually isn't an issue to get into that.

Posted on: 2012/4/17 21:13
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Re: One from last year

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Yeah, but on the tiny, steep mountain freestoners timing can be all messed up! I know a few where March browns are typically June, drakes in July, and cahills in July/August.

Posted on: 2012/4/17 21:22


Re: One from last year
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It is a Cahill. Does anyone know why they they don't still use Stenacron? I think they are are light Cahills too.

Posted on: 2012/4/17 21:26


Re: One from last year
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OK then they are bigger and browner, so use the bigger and browner imitation.

Posted on: 2012/4/17 21:26
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Re: One from last year
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Quote:

dkile wrote:
It is a Cahill. Does anyone know why they they don't still use Stenacron? I think they are are light Cahills too.


Why do you say light cahill? If you check the TN site under the genus I picked it has a pic from the Little J on May 27.

My first guess without looking was light cahill or Yellow Cahill I would call it but after checking the evidence led me to my suggestion.

Whats important is its a cahill and likely the underside is cream colored like nearly all of them so a mottled winged (lemon colored) cream imitation would be the choice.

Posted on: 2012/4/17 21:31
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Re: One from last year

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^ amen!

that was in regards to the bigger browner post

Posted on: 2012/4/17 21:32
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Re: One from last year
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Don't put me on the defensive. I picked Stenacron, because of the body color and size...I think. But if you look at the legs it clearly is the Maccaffertium. If you match it up with a March Brown you can see how close they look. The MB is larger and has the browner coloring.

So your saying a #12 or #14 Adams then? Kidding.

Posted on: 2012/4/17 22:33


Re: One from last year

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Quote:
Does anyone know why they they don't still use Stenacron?


Science. :)

Family/genus/species, etc. are classifications which describe how close species are related to one another evolutionarily. Species within a genus are close cousins. Within a family are distant cousins. Between families are fairly unrelated.

When we first classified them, you could consider it educated guesses based on observed traits. They did pretty good, considering the thousands of species out there and they only screwed up a few! But with more advanced methods, such as DNA analysis, we are finding our mistakes.

Stenacron still exists. It's just that some of the former members were more closely related to the species in maccafertium than they were to the species which still reside in stenacron. So they moved them. Making things clearer for entomologists, and more confusing for us fishermen!

When you compare the light/cream cahills to, say, March Browns, the close relation is obvious. All that's really different is color and timing. Which are two things that genetically can change very easily, unlike, say, growing an extra tail or a hind wing, which takes a very long time to develop.

Posted on: 2012/4/17 22:46


Re: One from last year

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Pink cahill(Epeorus Vitreus), however, I'm hedging my bets, because none of the suggested flies are uusually as small as 8 to 10 mm. But Pink Cahill come closest.

Posted on: 2012/4/18 7:12
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Re: One from last year

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Epeorus don't have mottled wings. This bug clearly has mottled wings.

And I've NEVER heard Epeorus Vitreus described as a cahill of any type. I've heard them described by common names pink lady, sulpher, yellow quill, PED's, and little maryatt's, but never cahill.

I'm fairly certain you're looking at maccaffertium genus. It's just that the genus has a bunch of different species that I can't tell apart, so I have no faith that I'd get the species correct.

Posted on: 2012/4/18 7:43


Re: One from last year

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Quote:

Chaz wrote:
Pink cahill(Epeorus Vitreus), however, I'm hedging my bets, because none of the suggested flies are uusually as small as 8 to 10 mm. But Pink Cahill come closest.


It looks like an Epeorus vitreus (Pink Lady) to me too. I didn't go through the key, I'm just going on an off the cuff, looks like that to me type of "analysis." If anyone really does take it through the key, I'd be interested in what you come up with.

Posted on: 2012/4/18 7:45


Re: One from last year

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E. Vitreus is a pink lady aka pink cahill. However troutnut has them as a sulphur which is the only time I've seen troutnut get something wrong. It is E Vitreus. I don't care what the common name you use for the fly pictured.

http://www.troutnut.com/hatch/556/Mayfly-Epeorus-vitreus-Sulphur

Posted on: 2012/4/18 22:07
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