GTDB release 9 based on RefSeq 220 (R09-RS220) is live at This release covers 596,859 genomes (48% increase) and has 113,104 species clusters (33% increase). Release notes at: Release statistics at:

GTDB now indicates the phylogenetic diversity of each phyla:

GTDB-Tk v2.4.0 has been released along with reference data for GTDB R09-RS220. Updating to the latest reference data is recommended. More information about GTDB-Tk can be found at

We are also on Bluesky under the handle @ace-gtdb.

RT @m_chuvochina: Final version of the GTDB-defined higher taxa ms is live. @ace_gtdb @seq_code #ICNP #nomenclature

A minor update to GTDB R08-RS214 has been released. GB_GCA_902406375.1 was incorrectly classified as Collinsella sp905215505 instead of C. sp002232035 in a few GTDB data files. Full details can be found here:

GTDB-Tk v2.3.0 has been released along with reference data for GTDB R08-RS214. Updating to the latest reference data is recommended. More information about GTDB-Tk can be found at

GTDB release 8 based on RefSeq 214 (R08-RS214) is live at This release covers 402,709 genomes (27% increase) and has 85,205 species clusters (30% increase). Release notes at: Release statistics at:

GTDB is on a mission to promote excellence in research by linking its content with the iconic taxonomic resource - Bergey's Manual of Systematics of Archaea and Bacteria. Access to the chapters is available in our Taxonomy Tree viewer via your institutional subscription.

GTDB-Tk v2.2.1 has been released. This introduces an ANI classification stage that can reduce processing time by 25 to 60%. You can find more details at

The Taxonomy Tree view now indicates the number of descendant genomes and children taxa. #gtdb

GTDB-TK v2 manuscript is now out in Bioinformatics. This release substantially reduces memory requirements.

GTDB-Tk v2.1.0 has been released. This address issues identified with the divide-and-conquer approach. New reference data must be downloaded. You can find more details at

@michaelviridae @donovan_parks The gtdbtk_r207_v2_data.tar.gz data files are for GTDB-Tk v2.1.0 which will be released shortly. This addresses the reported issue with the divide-and-conquer approach.

@SilasKieser @MikeTisza GTDB only fetches genomes from the NCBI Assembly DB. However, I would contact NCBI to see if genomes submitted via TPA will end up in the Assembly DB. This use to be the case.

Shigella species have been classified as later heterotypic synonyms of E. coli in GTDB R07-RS207. The rationale for this classification is explored in

An issue in the divide-and-conquer approach in GTDB-Tk v2.0.0 has been identified. We are working on a solution. In the meantime, please use the full tree (--full-tree) when classifying genomes. Thank you to Florian Oñate for bringing this issue to our attention. Please retweet.

GTDB-Tk v2.0.0 with GTDB R07-RS207 reference data has been released. This version introduces a divide-and-conquer strategy that reduces memory requirements to <40GB and uses a new set of 53 archaeal marker genes. Updating is recommended.

GTDB release 7 based on RefSeq 207 (R07-RS207) is live at This release covers 317,542 genomes (23% increase) and has 65,703 species clusters (37% increase). Release notes at: Release statistics at:

Check out the recent improvements to the GTDB website ( by @aaronmussig. Better styling, a new FastANI calculator, and enhanced taxon history browsing.