Three truths
- Timed
- Began about 2.6 billion years ago · the last 62% of life's story
- Named
- ≈6,800 named living species · 0.4% of all named
- Weighed
- Part of Bacteria (≈70 Gt C), not measured separately.
Bacteria · phylum
Pseudomonadota (Proteobacteria)
Pseudomonadota
Living · roughly 6,800 described species
The date or placement of this group is still debated.
A huge and varied group of bacteria, long called Proteobacteria. It includes many familiar microbes and the ancestors of mitochondria.
Key characteristics
- Mostly Gram-negative, with a double membrane
- Very diverse metabolism
- Includes free-living species and pathogens
- Branched off
- About 3.2 billion years ago (approximate)
- Parent lineage
- Gracilicutes
Child lineages
Classification
Sources
- Pseudomonadota (Wikipedia) · Wikipedia
- TimeTree: the timescale of life · TimeTree
- Open Tree of Life · Open Tree of Life
- Tree of Life Web Project · Tree of Life Web Project