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Cloeon dipterum : ウィキペディア英語版 | Cloeon dipterum
''Cloeon dipterum'' is a species of mayfly with a Holarctic distribution. It is the most common mayfly in ponds in the British Isles and the only ovoviviparous mayfly in Europe. Males differ from females in having turbinate eyes. ==Description== In common with other members of the genera ''Cloeon'' and ''Procloeon'', ''C. dipterum'' has a single pair of wings. This is also reflected in the specific epithet ''dipterum'', which is from the Latin ''ラテン語:di-'', meaning two, and the Greek ', meaning wing, and in his original description, Carl Linnaeus stated ''ラテン語:Inferiores alæ vix existunt'' ("smaller wings hardly present").〔 The compound eyes of ''C. dipterum'' show a striking sexual dimorphism, whereby females have lateral apposition eyes, while the males' eyes have an additional dorsal "turban-shaped" parts that function as superposition eyes. These extra eyes are thought to enable the males to locate isolated females in the mating swarm.〔
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