A taxonomic category that ranks below kingdom and above phylum or division.
- They are placed in their own subkingdom because they are so unlike any other animals.
- These organisms were previously classified as a primitive subkingdom of the plant kingdom, the thallophytes: plants that lack true roots, stems, leaves, and flowers.
- It is impossible to divide the first two subkingdoms according this principle and we can consider that there is only one type in each of them.
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