體長約55~58mm,雄蟲複眼為藍綠色,翅痣為黑色,全身覆蓋藍灰色粉,腹部第7節一小部分及第8~10節為黑色,後翅基部有黑色翅斑,未熟個體與雌蟲很類似。雌蟲臉部為黃褐色,合胸正面為黃褐色,中央有黑合胸縱紋,側面有2條黑斑,有兩塊大型黃斑,翅膀末端有明顯黑褐色翅斑,腹部黃褐色或暗褐色,背面兩側有一條模糊黑縱紋,第7~9節黑色;老熟個體腹部顏色有黑化情形,與雄蟲一樣也會覆蓋白粉,只是淡得多。
分布於低海拔山區的池塘或溪流中,是常見的種類,棲息量不少,主要出現期在每年的5~11月。成蟲特別喜歡在有泥質底層的淺水或靜止水域活動。長滿濃密長毛的水蠆,也大多趴附在淺水處的泥底,靠著密生長毛沾滿細泥的外表,偽裝躲藏起來。雌蟲點水產卵,雄蟲會在附近警戒。
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