大蜆是簾蛤目蜆科大蜆屬的一種。殼長最大達8公分,高度達7公分以上,為世界所知最大的蜆科物種,因而得名。主要分布於台灣淡水河,埋棲於水深土砂中3-5米。曾因棲地汙染,一度被認為滅絕,現已再度被紀錄。[1]
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