Mayfly - Callibaetis floridanus

Moved

Moved from Callibaetis.

… John R. Maxwell, 25 July, 2009 - 10:38pm

Callibaetis

This is probably C. floridanus.

… Lloyd Gonzales, 25 July, 2009 - 7:41pm

Moved

Moved from Mayflies.

… John R. Maxwell, 24 July, 2008 - 11:20pm

Callibaetis

I agree that this baetid appears to be a female Callibaetis imago.

… Lloyd Gonzales, 9 July, 2008 - 5:34pm

Narrowing it down

Lew-

Very nice photo. Was (were) the other tail(s) broken off, or did it (they) just not show in the photo due the artificial lighting? Also, what was the approximate length (in mm.) not including tails?

If it has (had) three tails, it is likely either Brachycentrus, Caenis, or Tricorythodes. If it has (had) two tails, it could be Callibaetis. However, they have minute elongate hind wings, and I don't see any hind wings in your photo, but they can be difficult to see on an imago.

In any event, your photo appears to be of a female imago.

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… Roger Rohrbeck, 2 November, 2005 - 3:49pm

Narrowing it down

Roger, thanks so much for your comments. The length of this specimen was about 15-16mm. Can't be sure of the number of tails of this particular specimen but a moment later another fly of essentially identical size, pattern, and coloration momentarily lit in the same area. It had three tails.

… Lew Scharpf, 2 November, 2005 - 8:53pm

Lew- Does 15-16mm. include

Lew-

Does 15-16mm. include the length of the tails?

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… Roger Rohrbeck, 3 November, 2005 - 5:13pm

Body length

Roger, the 16mm does include the length of the tails. I would say the body length was 8-10mm and with tails perhaps as much as 18mm.

… Lew Scharpf, 3 November, 2005 - 7:35pm

Maybe Callibaetis

Lew-

Okay, using a total length including tail(s) of 18mm., the body appears to be about 40% of that length, which would be ~7mm. That would pretty much take it out of the size range for the 3-winged genera I mentioned, but would be just about right for a later brood female imago Callibaetis. Also, as I look closer at a blowup of your photo, I think that I see hints of a minute and elongate hind wing. However, I've never seen a Callibaetis fore wing that looked quite like yours. Perhaps someone else has an idea on this one. If not, I may see if I can get some professional help with the ID.

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… Roger Rohrbeck, 4 November, 2005 - 3:01pm

Maybe Callibaetis

Lew-
Of course, I meant 3-tailed, rather than 3-winged in previous comment!
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… Roger Rohrbeck, 5 November, 2005 - 1:16pm

Callibaetis

Lew-
Notice striking similarity to this Callibaetis female imago.
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… Roger Rohrbeck, 6 November, 2005 - 3:20pm

Thanks, Roger. I appreciate all of your efforts on this.

… Lew Scharpf, 4 November, 2005 - 4:19pm