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Pic 13580
Full size 193 kb 
Upl on 2013-01-22

Sieboldius japponicus Selys, 1854
Photo taken in Sabah (Malaysia) on 2009-08-31

In the middle of the secondary genitalia (the accessory organ) on segment 2 of this male Sieboldius japponicus is a pair of extended hamulus.

The hamulus is a pair of hooks used to hold the female’s genitalia during copulation.

The hamulus is also a set of “surgical tool” that a male uses for removing sperm left by other males during previous mating.

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Pic 13617
Full size 218 kb 
Upl on 2013-01-24

Sieboldius japponicus Selys, 1854
Photo taken in Sabah (Malaysia) on 2009-08-31

This male Sieboldius japponicus was found in a swift flowing stream in a Malaysian forest reserve in Sabah.

The black and white body color make it unique from the green color of other in the same family Gomphidae.

The measurement is :
Wing span = 6cm
Body length = 8.4cm

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Pic 13578
Full size 187 kb 
Upl on 2013-01-22

Sieboldius japponicus Selys, 1854
Photo taken in Sabah (Malaysia) on 2009-08-31

Sieboldius japponicus Selys, 1854

Anal Appendages of a male dragonfly usually in a set of 2 long superior appendages and 1 short inferior appendage.

But this male Sieboldius japponicus's superior and inferior appendages are both in a pair (2 each) and both are short.

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Pic 13616
Full size 235 kb 
Upl on 2013-01-24

Sieboldius japponicus Selys, 1854
Photo taken in Sabah (Malaysia) on 2009-08-31

A male Sieboldius japponicus

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Pic 8645
Full size 63 kb 
Upl on 2011-07-22

Sieboldius nigricolor (Fraser, 1924)
Photo taken in Chiang Mai (Thailand) on 2010-03-25

Species spotted at Huay Gair-o Waterfall at the base of Doi Suthep, Chiang Mai. Unfortunately, this was the only one I saw.
A female.
Thanks to Noppadon Makbum for attempting to I.D. this species.

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Pic 8644
Full size 58 kb 
Upl on 2011-07-22

Sieboldius nigricolor (Fraser, 1924)
Photo taken in Chiang Mai (Thailand) on 2010-03-25

Species spotted at Huay Gair-o Waterfall at the base of Doi Suthep, Chiang Mai. Unfortunately, this was the only one I saw.
A female.
Thanks to Noppadon Makbum for attempting to I.D. this species.

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Pic 6495
Full size 125 kb 
Upl on 2009-08-29

Sinictinogomphus clavatus (Fabricius, 1775)
Photo taken in XuZhou, Jiangsu (China) on 2007-05-30

I think it is an exuvie of Ictinogomphus clavatus, but I am not really sure; please Check !!

The picture was taken in XuZhou, Yunlonghu Lake.

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Pic 6494
Full size 107 kb 
Upl on 2009-08-29

Sinictinogomphus clavatus (Fabricius, 1775)
Photo taken in XuZhou, Jiangsu (China) on 2007-05-30

The picture was taken in XuZhou, Yunlonghu Lake.

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Pic 4065
Full size 268 kb 
Upl on 2008-09-23

Sinictinogomphus clavatus (Fabricius, 1775)
Photo taken in (China) on 2006-07-15

Foto taken at Beijing University

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Pic 577
Full size 414 kb 
Upl on 2004-12-29

Sinictinogomphus clavatus (Fabricius, 1775)
Photo taken in (China) on 2004-05-30

Photo taken on the campus of Beijing University.
Probably male Sinictinogomphus clavatus?

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