Ecdyonurus torrentis (Mayfly)

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Peter Maihoefer
Posts: 52
Joined: Thu May 20, 2021 5:35 am
Location: Southern part of Germany

Ecdyonurus torrentis (Mayfly)

Post by Peter Maihoefer »

E. torrentis Subimago male Mirror.jpg
Ecdyonurus torrentis (Large brook dun)
Nymphs of Ecdyonurus torrentis are typically found in riffle areas of rivers and streams. They are usually found clinging to submerged plants and stones. E. torrentis feeds either by scraping periphyton from the substrate or by gathering fine particulate organic detritus from the sediment.

Mayflies are easier to determine if you have the larva and the male Imago. So I pick up maturity larvae and put it in a aquarium with current and air pump.

The subimago have a typical "Z line" in the wing. The best determination is made by the male genitals.

E. torrentis have one generation in a year. At my location the main flight time is April and May.
Attachments
Ecdyonurus torrentis Larvae 1.jpg
Ecdyonurus torrentis Larvae 3.jpg
E. torrentis female subimago.jpg
E. torrentis Imago male.jpg
E.torrentis Penis dorsal.jpg
E.torrentis Penis ventral.jpg

MarkSturtevant
Posts: 1942
Joined: Sat Nov 21, 2015 6:52 pm
Location: Michigan, U.S.A.
Contact:

Re: Ecdyonurus torrentis (Mayfly)

Post by MarkSturtevant »

Very well done!! Good lessons in here too.
Mark Sturtevant
Dept. of Still Waters

Peter Maihoefer
Posts: 52
Joined: Thu May 20, 2021 5:35 am
Location: Southern part of Germany

Re: Ecdyonurus torrentis (Mayfly)

Post by Peter Maihoefer »

Thank you very much Mark.

supplement to the fotos: title picture: Subimago (Male) on a mirror

second p.: Larva, here you see the flat style and the legs are like a spoiler (the first formel 1 car!!). The flowing water press the larva on the stone.
In the current the head looks every time again the water flow.

third p.: in transmitted light to see the fine structures and hairs.

fourth p.: Subimago (Female), the usual position is upside down, hanging under leaves, but for my eyes the upright position is better to view.

fifth p.: Imago (Male), the transformation from subimago to imago lengthened the first leg pair and the cerci (approx. 5 cm)

sixth p.: Genitals dorsal (from above)

seventh p.: Genitals ventral (bottom view)

Sumguy01
Posts: 1715
Joined: Mon Jan 28, 2013 11:05 pm
Location: Ketchikan Alaska USA

Re: Ecdyonurus torrentis (Mayfly)

Post by Sumguy01 »

:D Nice set.
Thanks for sharing.

micro_pix
Posts: 469
Joined: Fri May 11, 2012 12:05 pm
Location: Southampton, Hampshire, UK

Re: Ecdyonurus torrentis (Mayfly)

Post by micro_pix »

Excellent!

Dave

Peter Maihoefer
Posts: 52
Joined: Thu May 20, 2021 5:35 am
Location: Southern part of Germany

Re: Ecdyonurus torrentis (Mayfly)

Post by Peter Maihoefer »

@sumguy and dave

Thanks for watching and every praise is a motivation to make more fotos and presentations.

Peter

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