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Chalcolestes viridis
''Chalcolestes viridis'', formerly ''Lestes viridis'', is a damselfly of the family Lestidae. It has a metallic green body and at rest it holds its wings away from its body. Its common name is the willow emerald damselfly〔 or the western willow spreadwing.〔(【引用サイトリンク】url=http://www.dragonflypix.com/checklist.html )〕
==Taxonomy==
The genus ''Chalcolestes'' is separated from ''Lestes'' because of differences in their larvae.
A closely related species ''C. parvidens'' used to be considered a sub-species of ''C. viridis''. ''C. parvidens'' occurs in Greece, Bulgaria, Croatia and in Italy; near Rome it flies with ''C. viridis'' in the same ponds. There are small morphological differences between the two species both as adults and larvae and analysis of proteins from the two species, by electrophoresis, also supports their separation into two species, but they are hard to tell apart in the field. ''C. parvidens'' flies earlier in the year than ''C. viridis''.
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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