大蚬是帘蛤目蚬科大蚬属的一种。壳长最大达8公分，高度达7公分以上，为世界所知最大的蚬科物种，因而得名。主要分布于台湾淡水河，埋栖于水深土砂中3-5米。曾因栖地污染，一度被认为灭绝，现已再度被纪录。[1]
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