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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 wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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Naaimzerox has attached this picture to aid in identification. The message is below.
Naaimzerox
Posts: 4
Posts: 4
Naaimzerox on Dec 30, 2017December 30th, 2017, 7:55 am EST
Hello, what kind of mayfly is this? I mean the name with the species. Thank you for your help.
Taxon on Dec 30, 2017December 30th, 2017, 1:44 pm EST
Hi Naaimzerox-
I believe this female imago to be of family Heptageniidae. Where is from, and when was it photographed?
I believe this female imago to be of family Heptageniidae. Where is from, and when was it photographed?
Naaimzerox
Posts: 4
Posts: 4
Naaimzerox on Dec 31, 2017December 31st, 2017, 4:44 am EST
I found it at Ulu Yam, Selangor, Malaysia. it was 3 months ago. Thank you for your reply
Taxon on Dec 31, 2017December 31st, 2017, 8:30 am EST
Thanks. Am only able to find one mayfly species (of family Heptageniidae) listed for Malaysia, which is Atopopus malaysianus. However, absent either a description or photo for purpose of comparison to the very nice photo you submitted for identification, who knows :-)
Millcreek on Dec 31, 2017December 31st, 2017, 8:42 am EST
I was able to find a couple of papers that list some mayflies for Malaysia and for Borneo. The links are below. The paper on Malaysian mayflies has a list starting on page 494.
http://www.tropecol.com/pdf/open/PDF_57_3/10%20Ghani%20et%20al.%20f.pdf
http://www.ephemeroptera-galactica.com/pubs/pub_s/pubsartorim2003p403.pdf
I looked further and found these photos under Thailand mayfly (google search) which look nearly identical to yours.
https://thailandwildlife.photoshelter.com/image/I0000UDik4riE7fg
https://thailandwildlife.photoshelter.com/image/I0000HnyisfBdMAU
Unfortunately, they do not list the mayfly by name, and as near as I can tell most Thai mayfly keys list nymphs rather than adults.
http://www.tropecol.com/pdf/open/PDF_57_3/10%20Ghani%20et%20al.%20f.pdf
http://www.ephemeroptera-galactica.com/pubs/pub_s/pubsartorim2003p403.pdf
I looked further and found these photos under Thailand mayfly (google search) which look nearly identical to yours.
https://thailandwildlife.photoshelter.com/image/I0000UDik4riE7fg
https://thailandwildlife.photoshelter.com/image/I0000HnyisfBdMAU
Unfortunately, they do not list the mayfly by name, and as near as I can tell most Thai mayfly keys list nymphs rather than adults.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
-Albert Einstein
Naaimzerox
Posts: 4
Posts: 4
Naaimzerox on Jan 1, 2018January 1st, 2018, 4:16 am EST
Thank you for all the information given. I will do more investigation. Any update is highly appreciated.
Naaimzerox
Posts: 4
Posts: 4
Naaimzerox on Jan 1, 2018January 1st, 2018, 10:54 pm EST
In your opinion, can it be Electrogena lateralis?
Wbranch on Jan 2, 2018January 2nd, 2018, 2:38 am EST
Naainzerox,
I know nothing about entomology but was wondering why you would think your mayfly is Electrogena lateralis after reading this quote I found by Googling the name you provided;
I know nothing about entomology but was wondering why you would think your mayfly is Electrogena lateralis after reading this quote I found by Googling the name you provided;
Electrogena lateralis is a common, though localised species in Scotland, Wales and the North and South West of England. Nymphs of this species are typically found in riffle areas of rivers and streams, although they can also occasionally be found on the wave-lashed shores of standing waters.
Catskill fly fisher for fifty-five years.
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