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''Enallagma cyathigerum'' (common blue damselfly, common bluet, or northern bluet) is a European damselfly. The species can reach a length of . It is common in all of Europe, except for Iceland. ==Identification== The common blue damselfly can be easily mistaken for the azure damselfly (''Coenagrion puella''), but on the back and the thorax, the common blue damselfly has more blue than black; for the azure damselfly it is the other way around. The second segment of the thorax has a distinctive spot with a line below connecting to the third segment. Another difference can be observed when inspecting the side of the thorax. The common blue damselfly has only one small black stripe there, while all other blue damselflies have two. A male is blue while a female is brown on a common blue damselfly. During mating, the male clasps the female by her neck while she bends her body around to his reproductive organs – this is called a mating wheel. The pair flies together over the water and eggs are laid within a suitable plant, just below the surface. The eggs hatch and the larvae, called nymphs, live in the water and feed on small aquatic animals. Nymphs climb out of the water up a suitable stem to moult into damselflies. Enallagma cyathigerum 5(loz).jpg|Distinctive marking at base of abdomen of male Common blue damselfly (Enallagma cyathigerum) newly emerged.jpg|newly emerged Common blue damselfly (Enallagma cyathigerum) immature male.jpg|immature male Common blue damselfly (Enallagma cyathigerum) male dorsal.jpg|adult male Common blue damselfly (Enallagma cyathigerum) male.jpg|adult male Common blue damselfly (Enallagma cyathigerum) heterochrome female.jpg|heterochrome female Common blue damselfly (Enallagma cyathigerum) heterochrome female (green variety).jpg|heterochrome female (green variety) 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「Enallagma cyathigerum」の詳細全文を読む スポンサード リンク
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