它不属于正规植物分类学的分类阶元的范畴。
It falls outside the scope of the formal taxonomic categories.
其科级分类阶元的分布型为10类。其中，以旧大陆热带、亚热带和温带分布型为主，次类型者有9科；
The families of these mammals were divided into 10 categories, in which the old-continent-tropic-subtropic and temperate zone is the largest type with 9 families.
其科级分类阶元的分布型为10类。其中，以旧大陆热带、亚热带和温带分布型为主，次类型者有9科；
The families of these mammals were divided into 10 categories, in which the old-continent-tropic-subtropic and temperate zone is the largest type with 9 families.
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