Select output fields

Family Genus Specific epithet Specific authority Infraspecific category
2C mean1(pg) 2C mean1(mbp) 2C range1 pg
Chromosome number (2n) Ploidy level
Number of 5S signals Range of 5S signals Position2 of 5S signals (5S P)
Number of 45S3 signals Range of 45S signals Position2 of 45S signals (45S P) Arrangement
Autosome or sex chromosome 5S chrom. type
Sex chrom. number 45S chrom. type
B chromosomes Ag-NOR
Original reference

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Family   Genus   Specific epithet
Chromosome number from: -   Ploidy level from: -

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1 source: Animal genome size database (
2 position refers to interstitial, pericentromeric, distal or occupying whole chromosome arm
3 refers to 45S rDNA (18S-5.8S-26S rRNA genes)

How to cite?

Reference to this work should be cited thus:

Sochorová J, Garcia S, Gálvez F. Kovařík A. Evolutionary trends in animal ribosomal DNA loci: introduction to a new online database. Chromosoma 2018; 127: 141–15.

Sochorová J, Gálvez F, Matyášek R, Garcia S, Kovařík A. Analyses of the Updated “Animal rDNA Loci Database” with an Emphasis on Its New Features. International Journal of Molecular Sciences. 2021; 22(21):11403.

We acknowledge the authors cited below for the pictures that illustrate the webpage. Most pictures have been obtained through Wikimedia Commons under the terms of a Creative Commons license.

Picture of Drosophila melanogaster (André Karwath aka Aka), picture of Mus musculus (4028mdk09), picture of Pterophyllum scalare (Citron / CC-BY-SA-3.0) , picture of Gallus gallus (Andrei Niemimäki), picture of Mytilus edulis (Benutzer:Darkone), picture of Leiolepis belliana (Rushenb), picture of Diabroctis mimas (Udo Schmidt), picture of Eisenia foetida (Rob Hille). Picutures of chromosomes from Ghigliotti et al., 2013 (157), Pérez-García et al., 2014 (285),Cazaux et al., 2011 (375).

Animal rDNA Database