The osteology and relationships of the Millerettidae (Reptilia: Cotylosauria)
The osteology and relationships of the Millerettidae (Reptilia: Cotylosauria)
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Millerettidae 的骨学和关系（爬虫类：子龙类）
DOI：
10.1111/j.1469-7998.1972.tb01731.x
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发表时间：
2009
影响因子：
2
通讯作者：
C. Gow
中科院分区：
文献类型：
--
作者：
C. Gow
在醋酸法制备的基础上，详细描述了千米虫科的形态。这表明千孔虫科是一个紧密结合的自然类群，分类结果更令人满意。这个群体的共同点是拥有类似于炭龙的毒牙。第二个重要的特征是，这些动物没有坚实的下颞柱。有人建议，这种情况的原因是寻求对颅骨运动的理解。缺乏颞条的原因可以追溯到两栖动物炭疽纲，这是由于下巴运动时脸颊区域的扩张和收缩。（在从两栖动物到爬行动物的过渡过程中，这些动作必然被最小化。）据此，有人认为千孔虫科可能直接产生了鳞片目。始祖龙和颈头兽可能有完全独立的起源。只有三个属被认为是有效的，即Miileretta (Broom, 1948)，其中颞开口首次出现，Millerosaurus (Broom, 1948)，其中jugal和quadratojugal之间的接触丢失，尽管jugal保留了一个细孔状的后边缘，以及一个基于Millerosaurus pricei （Watson, 1957）的新属Milleropsis，其中jugal和quadratojugal之间仍然有更大的分离，其中jugal的后边缘相当光滑。
The morphology of the Millerettidae is described in detail, based on careful preparation using the acetic acid technique. This shows that the Millerettidae constitute a closely knit natural group and results in a more satisfactory classification. Common to the group is the possession of anthracosaur-like vomerine fangs. A second feature of major importance is that these animals do not have a solid lower temporal bar. It is suggested that the reason for this is to be sought in an understanding of cranial kinesis. The reason for the lack of a temporal bar can be traced back to Anthracosaurian amphibia and is due to expansion and contraction across the cheek region during jaw movements. (These movements were necessarily minimized during the transition from amphibian to reptile.) Following from this it is suggested that the Millerettidae may have given rise directly to the Squamata. The Archo-sauria and Rhynchocephalia probably had an entirely independent origin. Only three genera are considered valid, viz. Miileretta (Broom, 1948) in which the temporal opening first appears, Millerosaurus (Broom, 1948) in which contact between jugal and quadratojugal is lost, though the jugal retains a crenellated posterior edge, and a new genus Milleropsis based on Millerosaurus pricei (Watson, 1957) in which there is still greater separation between jugal and quadratojugal and in which the posterior border of the jugal is quite smooth.