Scientific name: Idionyx selysi Fraser, 1926
Family: Corduliidae
Thai name: แมลงปอใหญ่เซลิส
male
I once thought that Idionyx species are found in rainy season, but recently my thought is wrong. I just came back from Chiang Rai and I found, among other odonates, Idionyx selysi there in the hottest month of Thailand. I went to the waterfall in the morning and don't see any Idionyx along the trail. But when I went down, I found this species perching vertically on low twigs with Macromidia genialis (shanensis). It's only 2.30 p.m. Idionyx has a unique flight signature in the way it fluttered, too.
male appendages
Male has metallic green body with yellow stripes as shown in photo above. Abdomen is black with middorsal stripe from S1-10. Dorsum of S-10 has horn pointed upward and yellow apically. Caudal appendages is simple long and slender as shown in photo below. Female is similar to the male. Wingbase is ochre.
female
This species is found in 300-900 m.a.s.l. throughout the country in April-August.
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