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Homoeoneuria ammophila? - Paraleptophlebia - male

Homoeoneuria ammophila? - Paraleptophlebia - Male
Chibougamau, Nord-du-Qu├ębec County, Quebec, Canada
September 1, 2010
Size: roughly 8 mm
I'm sorry for this badly shaped specimen, but so far, it has all the odds of expanding Bugguide a fair bit. This mayfly seems to belong to family Oligoneuriidae, a family characterized by the strongly reduced venation of the wings. Two genera are found across the Nearctic according to the revision of the genus made by Pescador and Peters in 1980, for a total of 8 species: 5 in genus Homoeoneuria Eaton, 1881 and 3 in Lachlania Hagen, 1868.

This specimen lacks many body parts, but might well belong to Homoeoneuria, based on the metathoracic trochanter forming a roughly 90 degrees angle with the metathoracic coxae. Given the current state of knowledge, and the colour patterns on the tergae, this might well be Homoeoneuria (Homoeoneuria) ammophila (Spieth).

Images of this individual: tag all
Homoeoneuria ammophila? - Paraleptophlebia - male Homoeoneuria ammophila? - Paraleptophlebia - male Homoeoneuria ammophila? - Paraleptophlebia - male Homoeoneuria ammophila? - Paraleptophlebia - male Homoeoneuria ammophila? - Paraleptophlebia - male


Moved from Mayflies.

Paraleptophlebia praepedita
Hi Yann-

Your mayfly male imago appears (to me) to be Paraleptophlebia praepedita.

P. moerens or P. debilis
Lloyd Gonzales has made the following comment relative to the identity of this mayfly on my flyfishing entomology forum:

I've been looking at this specimen for quite some time, and I don't believe this is P. praepedita. That species is distinguished by penial lobes that are as long or longer than the 1st segment of the claspers and lacks the basal enlargement of the claspers. The genitalia and basal enlargement of the claspers suggests that this is either P. moerens or P. debilis. I somewhat favor debilis based on the collection date, but both species may have multiple broods or cohorts.

thank you Roger for your input - I was eagerly waiting for someone more knowledgeable than me on this order to give a thought on this one, as, had it indeed been an Oligoneuriidae, this would have been a provincial first for the whole family, according to the (admittedly outdated) documentation I have.

After browsing the web to find more information on the species, it seems this northern town is a likely place to collect it and it seems that morphologically, it's indeed a good match. I had focused on the wings that seemed to have a quite reduced venation, as in Oligoneuriidae, but the adult pictured here ( has most veins so weak that they could pass for absent on a damaged specimen like mine.

You are welcome
And, after all, it's a new species for the guide. :-)

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