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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
Number of chromosomes with both 5S and 45S in the same arm (SA) Number of chromosomes with both 5S and 45S signals (SC)
Original reference Number of chromosomes with co-localized 5S and 45S signals (Coloc.)

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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)


Some journals publishing on animal molecular cytogenetics

Links to databases on plant chromosome numbers
and cytogenetics, including genome size

Links to Ribosomal RNA/DNA databases (sequence data)

Protocols for Cytogenetic Mapping of Arthropod Genomes

Some journals publishing on plant and animal molecular cytogenetics

Other useful links

Animal rDNA Database