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Census of the phylogenetic divisions inside the Bacteroidetes phylum (NCBI, October 2010).
| Class | No. of families | No. of genera | No. of species |
|---|---|---|---|
| Bacteroidia | 5 | 28 | 858 |
| Flavobacteria | 3 | 110 | 3583 |
| Sphingobacteria | 3 | 29 | 787 |
| Cytophagia | 3 | 47 | 765 |
| Unclassified strains | – | – | 996 |
