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Age ranges for key divergences discussed in the text in millions of years (Ma).
| Clade | Estimated age of crown group | 95% Confidence interval | Estimated age of total group | 95% confidence interval |
|---|---|---|---|---|
| Nitrosococcaceae | 325 | 194–490 | 894 | 596–1169 |
| Nitrosomonadaceae | 538 | 414–662 | 657 | 510–821 |
| Nitrospira | 124 | 59–197 | 238 | 149–329 |
