下列哪项不是蛤蚧的性状特征

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【单选题】【消耗次数：1】

下列哪项不是蛤蚧的性状特征

① 头略呈扁三角状，无异型大齿，吻鳞不切鼻孔

② 腹背部呈椭圆形

③ 背部呈灰黑色或银灰色，有黄白色或灰绿色斑点

④ 尾长为体长的2倍

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