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| Ceriagrion tenellum ： ウィキペディア英語版 |
Small red damselfly
The small red damselfly (''Ceriagrion tenellum'') is a small damselfly flying in heathland bogs and streams. It is in the family Coenagrionidae.
==Identification==
''C. tenellum'' is only long. It is a lot shorter than the large red damselfly, with which it is sometimes confused. In both sexes the thorax is bronze-black on top.
The male has an entirely red abdomen.
The female has a bronze-black abdomen with only the front and back of it red. The dark form ''melanogastrum'' has an almost entirely dark abdomen marked with pale segment divisors, the last two of which are reddish. A very rare form, ''erythrogastrum'', resembles the male.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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