(四節蜉蝣科)體長12.2mm,體色黃褐色,複眼扁圓,上側具橙色環紋,陀螺狀,兩眼相連,前胸背板光滑,兩側具褐色突起的瘤狀物,腹背黃色,兩側紅褐色,具尾絲2條。翅膀透明略呈三角形,後翅不及前翅一半長。 本種分布於低海拔山區之溪流環境,尾毛極長,翅膀在閃光燈的照射下散發出紫色的光澤十分美麗。
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5-6mm
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4.5mm
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