Prokaryotic bacteria and blue-green algae and various primitive pathogens,because of lack of consensus on how to divide the organisms into phyla informal names are used for the major divisions.

• 原核细菌蓝绿海藻和各种原始病原体，由于在有机体如何划分为门方面未取得一致意见，主要的分类有许多非正式的名称。