GTDB r89 spans 145,904 genomes organized into 24,706 species clusters.
GTDB taxa are comprised of isolate genomes, metagenome-assembled genomes (MAGs), and single-amplified genomes (SAGs). The following plot indicates the proportion of taxa at each taxonomic rank comprised exclusively of isolate genomes, exclusively of environmental genomes (i.e. MAGs/SAGs), or both isolate and environmental genomes.
Each GTDB species cluster is represented by a single genome. Genomes assembled from the type strain of the species were selected where possible, though the majority of species clusters are currently assigned only placeholder names. The proportion of species clusters comprised of isolates or environmental genomes is given for each species category.
The quality of the genomes selected as GTDB species representatives is given below. Genome completeness and contamination were estimated using CheckM and are colored based on the MIMAG genome standards. In general, representative genomes were restricted to having a quality satisfying completeness - 5*contamination >50. A few exceptions exist in order to retain well-known species with abnormal CheckM quality estimates.
Taxa encompassing the largest number of GTDB species clusters is given for each taxonomic rank.
Taxa encompassing the largest number of genomes in the GTDB is given for each taxonomic ranks.
The following graphs show the relative evolutionary divergence (RED) of taxa at each taxonomic rank from phylum to genus. RED values provide an operational approximation of relative time with extant taxa existing in the present (RED=1), the last common ancestor occurring at a fixed time in the past (RED=0), and internal nodes being linearly interpolated between these values according to lineage-specific rates of evolution. RED intervals for normalizing taxa at taxonomic ranks was operationally defined as the median RED value (indicated by a blue bar) at each rank ±0.1 (indicated by grey bars).