體長約38~44mm，雄蟲複眼為紅色，合胸及腹部為紅色，因此得名。腹部背面中央具一條不明顯的縱向細黑線，翅膀呈透明狀，後翅翅基有褐色斑紋，翅痣為黃褐色。雌蟲複眼上半部為褐色下半部為灰藍色，合胸及腹部為黃褐色或褐色，腹部背面的黑線比較明顯，後翅基部有褐色斑，翅痣為黃褐色，老熟雌蟲體色變為灰褐色，未熟雄蟲外觀近似雌蟲，可從腹部末節的攫握器或尾毛分辨。
生活於平地至低中海拔山區，常見於池塘、沼澤、水田等靜水域環境活動，成蟲於3至12月出現，雌蟲以點水方式產卵，為常見的種類，數量很多。
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