角质齿 horny tooth

互联网2013-11-14

855

指圆口类口的周围和舌上所具有的齿状物以及无尾两栖类的蝌蚪口的上下所具有的齿状物。是表皮的角化物，与脊椎动物真正的齿不同，圆口类的角齿呈圆锥状，消磨之后能更新，蝌蚪的角齿在变态时与同是角化物的所谓颚同时脱落。

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