中文摘要：

采用扫描电镜技术研究了角蟾科8种蝌蚪角质颌的显微结构特征和形态特点,阐述了角质颌对蝌蚪觅食方式的影响。实验结果表明：角蟾科蝌蚪的角质颌属于两个不同的类型。拟髭蟾亚科和掌突蟾亚科的蝌蚪具有相似的显微结构特征：角质颌呈厚重的＂U＂型,角质化程度高。颌鞘呈基部宽、顶端尖的圆锥形;角蟾亚科的蝌蚪角质颌呈纤弱的弓型,角质化程度低。颌鞘呈基部窄、长而顶端略弯曲的象牙型。进一步的分析发现,8种蝌蚪的颌鞘直径和密度呈显著负相关。这种显微结构的变化趋势也反映出蝌蚪对栖息环境和觅食方式的适应性。

英文摘要：

The jaw sheaths morphology of eight megophryid larvae were examined using scanning electron microscope. The morphology of jaw sheaths of Leptobrachiinae and Leptolalaginae larvae was similar. Their jaw sheaths were U-shaped and strong keratinized, the serrations were pyramidal, with broad-based and short pointed. While the jaw sheaths of Megophryinae larvae were less curved and weak keratinized, the serrations were ivory-shaped, with narrow-based and long pointed. It has been found that the relationship between serration’s diameter and density was negatively correlated, the changing trend reflected the functional significance of serrations. These distinctions among the jaw sheaths of tadpoles most could be related to their specific ecological habits and to their dietary specializations.