SILVA
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 
Click here
SILVAngs
Check out our service for Next Generation Amplicon data
SILVA Alignment, Classification and Tree (ACT) Service
The SILVA ACT service combines alignment, search and classify as well as reconstruction of trees in a single web application.
SILVA ACT is available at: 
www.arb-silva.de/act
SILVA Tree Viewer
The SILVA Tree Viewer is a web application to browse and query the SILVA guide trees.
A technical preview is available at 
www.arb-silva.de/treeviewer. The Tree Viewer for SILVA 132 LSU can be found here.
ARB
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 
www.arb-home.de.
UniEuk
SILVA is a member of the UniEuk project, a community-based project to achieve a universal taxonomic framework for Eukaryotes, focused primarily on protists. UniEuk is integrating information from relevant genetic markers and classical morphology-based data, validated by a comprehensive network of taxonomy experts.
Citations
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. Nucl. Acids Res. 41 (D1): D590-D596.
For the taxonomic framework:
Yilmaz P, Parfrey LW, Yarza P, Gerken J, Pruesse E, Quast C, Schweer T, Peplies J, Ludwig W, Glöckner FO (2014) The SILVA and "All-species Living Tree Project (LTP)" taxonomic frameworks. Nucl. Acids Res. 42:D643-D648
SILVA Terms of Use/License Information
As of release 138 the SILVA databases, its taxonomy, and all files provided for download are licensed unter Create Commons Attribution 4.0 (CC-BY 4.0).
All data is freely available for academic and commercial use as long as SILVA is credited as original author and a link to the full license is provided.
Releases before SILVA 138 are not affected by the new license. Please refer to the license file provided in each download directory for the license associated with the provided files.
Partners
Please visit our partners. They facilitate the SILVA database project.
SILVA RSS Feed + ARB & SILVA User Group
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News
Merry Christmans & Happy New Year 2020
The SILVA Team wishes you a Merry Christmas & Happy New Year. Many thanks for all your feedback and support to improve SILVA and SILVAngs. Looking forward to see you again in 2020.
SILVA 138 SSU released
Finally it is done... SILVA 138 SSU is released. LSU will follow in Spring 2020. Please note: The Treeviewer and SILVAngs are still on SILVA 132. Updates are planned for January 2020. Many thanks for your patience, the next release will come faster (hopefully).
SILVA SSU Release 138 in November
We know you all are looking forward to the release of SILVA SSU 138. We are currently in the last steps of creating the release and plan to release SILVA SSU 138 in the week of November 11. We are sorry for the additional delay and the inconveniences it may cause.
Update on SILVA Release 138
We are sorry to inform you that the SILVA Release 138 is delayed further and we have decided to release the SSU and LSU datasets separately to compensate for the delay. We estimate the SSU datasets to be available in October and the LSU datasets by the end of the year. This news article will give you some background information on the release.
User satisfaction survey
SILVA is now part of the German Network for Bioinformatics Infrastructure de.NBI.
To evaluate and improve our quality of service we need your feedback. Please help us by participating in this short survey.
SILVA SSU 138 / LSU 132 - full release
| SSU 138 Parc |
SSU 138 Ref NR 99 |
LSU 132 Parc |
LSU 132 Ref |
||
|---|---|---|---|---|---|
| Minimal length | 300 | 1200/900 | 300 | 1900 | |
| Quality filtering | basic | strong | basic | strong | |
| Guide Tree | no | yes | no | yes | |
| Release date | 12.12.19 | 12.12.19 | 13.12.17 | 13.12.17 | |
| Aligned rRNA sequences | 9,469,656 | 510,984 | 907,382 | 198,843 |