subphylum

例句：

1. 1. The classification of life formsis based on their evolutionary relationships, whichcan be divided into several superordersand subclasses.
   生命形式的分类基于它们之间的进化关系，可以划分为几个超纲和亚纲。
2. 2. In the study ofevolution, scientists often use the concept ofsubphyla to describe groups of organisms that share a common ancestor.
   在进化研究中，科学家们经常使用“亚纲”这一概念来描述共享共同祖先的生物群体。
3. 3. The discoveryof new species has led to the reclassification of some existing ones, asseen in the recent work on the classificationof insects.
   新物种的发现导致了对现有物种的重新分类，正如昆虫分类最近的工作所展示的那样。