Welcome to the SILVA rRNA database project

A comprehensive on-line resource for quality checked and aligned ribosomal RNA sequence data.

SILVA provides comprehensive, quality checked and regularly updated datasets of aligned small (16S/18S, SSU) and large subunit (23S/28S, LSU) ribosomal RNA (rRNA) sequences for all three domains of life (Bacteria, Archaea and Eukarya).

SILVA are the official databases of the software package ARB.

For more background information Opens internal link in current windowClick here


Check out our new service for Next Generation Amplicon data


The software package ARB represents a graphically-oriented, fully-integrated package of cooperating software tools for handling and analysis of sequence information.

The ARB project has been started more than 15 years ago by Wolfgang Ludwig at the Technical University in Munich, Germany, see Opens external link in new window

The data portal

Visit our partner site, the data portal for Marine Ecological Genomix, to get a feeling how your research can be improved using integrated databases.


Quast C, Pruesse E, Yilmaz P, Gerken J, Schweer T, Yarza P, Peplies J, Glöckner FO (2013) The SILVA ribosomal RNA gene database project: improved data processing and web-based tools. Opens external link in new windowNucl. Acids Res. 41 (D1): D590-D596.

If you use SINA please cite:

Pruesse, E, Peplies, J and Glöckner, FO (2012) SINA: accurate high-throughput multiple sequence alignment of ribosomal RNA genes. Opens external link in new windowBioinformatics, 28, 1823-1829

Opens internal link in current windowFurther references

SILVA Terms of Use/License Information

SILVA uses a dual licensing model. In short, browsing the content of the SILVA webportal (including results of the data analysis services) and deploying this information is free for all users but Downloads are only free for ACADEMIC users (redistribution of these downloads or their derivates requires a reference to the SILVA license terms). NON-ACADEMIC users please contact us for utilisation of any downloads. More details at SILVA Terms of Use/License Information

SILVA RSS Feed + ARB & SILVA User Group


Please visit our partners. They facilitate the SILVA  database project.




2nd de.NBI Quaterly Newsletter

The second edition of the de.NBI Quarterly Newsletter provides you the essentials on the recent and future development of the German Network for Bioinformatics Infrastructure – de.NBI.


ARB/SILVA(+BacDive) Training - Dec 1-4, 2015 in Bremen, Germany

Registration open until Oct 23, 2015. Follow the link above for detailed information and registration. The four-day course is an event of the Database Node of the German Network for Bioinformatics Infrastructure (de.NBI) and operated by Ribocon in collaboration with MPI Bremen and the DSMZ.


Several tax files updated

The following files have been updated since they contained errors:

  • taxmap_slv_ncbi_123.txt (missing last character at the end of the organism name)
  • tax_slv_ssu_123.txt (3 paths were missing)
  • (3 paths were missing)
  • tax_slv_ssu_123.tree (3 leafs were missing)
  • tax_slv_ssu_123.acc_taxid (137 missing IDs due to missing paths)
The missing paths/leafs:
  • Zea, genus, 10127 Eukaryota;Archaeplastida;Chloroplastida;Charophyta


The "All Species Living Tree" version 123 released

The new version of the "All Species Living Tree" based on SILVA release 123 has been released.

SILVA SSU / LSU 123 - full release

      SSU Parc SSU Ref SSU Ref NR LSU Parc LSU Ref
Minimal length     300 1200/900 1200/900 300 1900
Quality filtering     basic strong strong basic strong
Guide Tree     no no yes no yes
Release date     23.07.15 23.07.15 23.07.15 23.07.15 23.07.15
Aligned rRNA sequences     4,985,791 1,756,783 597,607 563,332 96,642

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