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

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 Opens external link in new


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


SILVA is a member of the Opens external link in new windowUniEuk 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.


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.

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. Opens external link in new windowNucl. Acids Res. 42:D643-D648

Opens internal link in current windowFurther references

SILVA Terms of Use/License Information

SILVA follows 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. Any downloads provided are free for ACADEMIC users. Redistribution of these downloads or their derivates requires a reference to the official SILVA license terms. NON-ACADEMIC users need to acquire a SILVA Commercial License for utilisation of any downloads provided. For the full text and how to acquire a commercial license, please refer to the Opens internal link in current windowSILVA Terms of Use/License Information


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


SILVA RSS Feed + ARB & SILVA User Group



Successfull UniEuk implementation meeting in Bremen

A great first UniEuk implementation meeting in Bremen. Many thanks for joining.


Great SILVAngs Power User Workshop

A big THANK YOU to our SILVAngs Power Users for joining us in Bremen. Your input will help a lot in improving our system and services.


SILVA 128 released

SILVA 128 released! Highlights: Improved taxonomy and Seed, updated LTP, SILVA Treeviewer online, UniEUK project launched and much more...


SILVA training course: From Primer to Paper

From Primer to Paper: Training in Biodiversity Analysis using NGS Amplicon Data - Application now open. Please follow the link for more information on the course content, registration, and payment.

SILVA SSU / LSU 128 - 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     28.09.16 28.09.16 28.09.16 28.09.16 28.09.16
Aligned rRNA sequences     5,616,941 1,922,213 645,151 735,238 154,297

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