摘要
The fossil record of diapsid reptiles does not provide conclusive evidence that the loss of the lower temporal arcade is correlated with the development of streptostyly. Analysis of the structure of the external jaw adductor in extant lizards results in the formulation of an alternative hypothesis to explain the loss of the lower temporal arcade in lepidosaurs. Extant lizards show the development of a posteroventral portion of the superficialis layer (lb) of the external adductor, which invades the lateral surface of the lower jaw, thus escaping the original confines of the external adductor. The development and expansion of a posteroventral lb muscle would have to be correlated with the loss of at least the posterior portion of the lower temporal arcade. Fossil lepidosaurs such as Clevosaurus, Prolacerta and Macrocnemus show the reduction of the lower temporal arcade from back to front, which is consistent with the hypothesis of the development of a posteroventral lb muscle.
摘要译文
桡足类爬行动物的化石记录并没有提供确凿证据，表明下部时间街区的丧失与链球菌的发展相关。现有蜥蜴的外部颌内收肌的结构分析导致了另一种假说的解释，以解释丢失的lepidosaurs中的较低时间的街机延长的蜥蜴显示外表面层（1b）的外表面层（1b）的发展，侵入下颌的侧表面，从而逃离外部内收肌的原始范围后腹部肌肉的发育和扩张必须与至少后期部分的损失相关联，例如Clevosaurus，Prolacerta和Macrocnemus等化石类狮子座显示了从后到后的下层时空拱廊的减少，这与后腹部肌肉发育的假说是一致的
OLIVIER RIEPPEL and RALPH W. GRONOWSKI. The loss of the lower temporal arcade in diapsid reptiles[J]. Zoological Journal of the Linnean Society, 1981,72(3): 203-217