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Naaimzerox has attached this picture to aid in identification. The message is below.
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NaaimzeroxDecember 30th, 2017, 12:55 pm
Posts: 4Hello, what kind of mayfly is this? I mean the name with the species. Thank you for your help.
TaxonDecember 30th, 2017, 6:44 pm
Site Editor
Plano, TX

Posts: 1275
Hi Naaimzerox-

I believe this female imago to be of family Heptageniidae. Where is from, and when was it photographed?
Roger Rohrbeck
www.FlyfishingEntomology.com
NaaimzeroxDecember 31st, 2017, 9:44 am
Posts: 4I found it at Ulu Yam, Selangor, Malaysia. it was 3 months ago. Thank you for your reply
TaxonDecember 31st, 2017, 1:30 pm
Site Editor
Plano, TX

Posts: 1275
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 :-)
Roger Rohrbeck
www.FlyfishingEntomology.com
MillcreekDecember 31st, 2017, 1:42 pm
Healdsburg, CA

Posts: 309
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.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
NaaimzeroxJanuary 1st, 2018, 9:16 am
Posts: 4Thank you for all the information given. I will do more investigation. Any update is highly appreciated.
NaaimzeroxJanuary 2nd, 2018, 3:54 am
Posts: 4In your opinion, can it be Electrogena lateralis?
WbranchJanuary 2nd, 2018, 7:38 am
York & Starlight PA

Posts: 2214
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;

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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