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Prokaryotic Phylogeny - Taxonomic Ranking (1306 words) |
 | Some of these phyla consist of only one or a few species (e.g., Thermomicrobia, Chrysiogenetes, Fibrobacteres, Deferribacters), whereas others such as Proteobacteria, Bacteroidetes, Cyanobacteria, Actinobacteria (high G+C gram-positive) and Firmicutes (low G+C gram-positive) are very large and comprised of thousands of species accounting for more than 90-95% of all known bacteria. |
| Fibrobacteres, Chlorobi) were once classified as parts of larger bacterial groups according to common morphological/physiological characteristics, but were later split apart in light of their branch patterns in 16S trees. |
| In the process, much of the information regarding the interrelationships between these groups was lost, so that their genealogies and branch order remain unresolved. |
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