Sieboldius is a genus of dragonflies in the family Gomphidae. The genus occurs in Asia and is closely related to the dragonhunter (Hagenius brevistylus) of North America.
The genus contains the following species: Sieboldius albardae Sieboldius alexanderi - small dragonhunter Sieboldius deflexus Sieboldius gigas Sieboldius herculeus Sieboldius japponicus Sieboldius maai Sieboldius nigricolor
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