Blue-winged Olives
Baetis
Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
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This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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Female Procloeon (Tiny Sulphur Dun) Mayfly Dun Pictures
This dun of a fairly large Baetidae species was one of only a couple I saw all evening.
This mayfly was collected from Enfield Creek in New York on August 24th, 2006 and added to Troutnut.com by Troutnut on August 27th, 2006.
Discussions of this Dun
Centroptilum or Procloeon?
22 replies
Posted by Troutnut on Aug 27, 2006
Last reply on Nov 10, 2015 by Sherryspinn
This dun seems to belong to one of those two genera. Does anybody know how to tell them apart? I can't find anything that doesn't require a male spinner.
Hind wings?
6 replies
Posted by Taxon on Aug 27, 2006
Last reply on Jul 14, 2011 by Troutnut
Jason-
My belief is that Plauditus, Pseudocloeon, and Procloeon are the Baetids absent hind wings, whereas Centroptilum (among the others) has minute hind wings. If I am correct, then given the choice you posed, that would make your specimen Centroptilum. This is (of course) strictly based on my having successfully digested the "available literature", and as I remember, there was a bit of inconsistency between authors in that area, so I probably chose to believe whichever one (or ones) I believed to have more credibility. Does any of this sound familiar?
My belief is that Plauditus, Pseudocloeon, and Procloeon are the Baetids absent hind wings, whereas Centroptilum (among the others) has minute hind wings. If I am correct, then given the choice you posed, that would make your specimen Centroptilum. This is (of course) strictly based on my having successfully digested the "available literature", and as I remember, there was a bit of inconsistency between authors in that area, so I probably chose to believe whichever one (or ones) I believed to have more credibility. Does any of this sound familiar?
Start a Discussion of Dun
References
- Jacobus, L. M., Wiersema, N.A., and Webb, J.M. 2014. Identification of Far Northern and Western North American Mayfly Larvae (Insecta: Ephemeroptera), North of Mexico; Version 2. Joint Aquatic Science meeting, Portland, OR. Unpublished workshop manual. 1-176.
- Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.
Female Procloeon (Tiny Sulphur Dun) Mayfly Dun Pictures
Collection details
Location: Enfield Creek, New York
Date: August 24th, 2006
Added to site: August 27th, 2006
Author: Troutnut
Date: August 24th, 2006
Added to site: August 27th, 2006
Author: Troutnut