體型為大型,雄蟲體長約62~70mm,頭、胸、腹部為鮮豔的墨綠色,具有金屬光澤,有時會因為光線照射角度的不同而呈現像琉璃般的寶藍色,沒有其他明顯的斑紋。翅膀為寶藍色,沒有翅痣。未熟雄蟲體色為藍色,翅膀為黑褐色且無光澤。雌蟲體色較為黯淡,合胸為墨綠色,腹部及翅膀為黑褐色,稍具金屬光澤,翅膀的翅痣為白色,相當明顯耀眼,是野外分辨雌雄的重要特徵,也因此得名。
分布於低中海拔山區,棲息在森林旁的溪流、山溝、瀑布等清澈的水域環境,成蟲分佈相當廣泛,是臺灣特有種,也是臺灣產豆娘中體型最大的,成蟲在4至12月出現,為常見的溪流性豆娘。飛行能力強,雄蟲具有明顯的領域性。
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