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The dragonhunter or black clubtail (''Hagenius brevistylus''), sometimes called the black dragon, is a clubtail dragonfly of the eastern United States and southeastern Canada. It is much larger than any other North American clubtail, at , with black and yellow markings and green eyes. Males can be distinguished at a distance by their habit of curling their abdomens under while flying, forming a sideways J shape.〔Kurt Mead. Dragonflies of the North Woods. Second edition. Duluth, MN:Kollath+Stensaas, 2009.〕 The dragonhunter is the only member of genus ''Hagenius''. Its closest relatives are Asian dragonflies of genus ''Sieboldius''. Together the two genera form the subfamily Hageniinae. The nymph is unusual, with a very flat, wide body. It is slow-moving and lives among bark and leaf litter at the edges of streams, where its dark color provides camouflage. The adult feeds on large insects, including darner and clubtail dragonflies, sometimes ambushing them from above.〔 It also takes monarch butterflies, eating the thorax and abdomen first to avoid the greatest concentration of cardenolide toxins.〔 〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Dragonhunter」の詳細全文を読む スポンサード リンク
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