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This page provides an up to the minute summary of data currently available in the database. Parameters reported include minimum and maximum reported genomes sizes (in picograms), mean genomes sizes with standard error (SE), total number of species assayed, and the methods, cell types, and standards used for all available records. Note that the statistics reported here are based on all records in the database -- for maximum reliability, you are encouraged to evaluate the data for your particular group of interest directly. Note also that these C-value summaries do not currently account for instances of polyploidy (though this will be updated in the future).

Because these statistics refer to the database as a whole, they must be cited as follows if used in a publication:

Please select your group of interest from the list:

(Other invertebrate groups are insufficiently represented for summary stats)


Number of nematodes:54
Smallest nematode genome size:0.02pg, Pratylenchus coffeae, Plant-parasitic nematode
Largest nematode genome size:2.50pg, Parascaris univalens, Horse roundworm
Mean for nematodes:0.15pg ± 0.03


  • Chromatin diminution found in some nematodes.
  • No correlation between genome size and body size in nematodes, but body size variation is driven in large part by levels of endopolyploidy (Flemming et al. 2000).
  • Click here for the nematode data page.

Summary of Methods, Cell Types, and Standard Species for Nematodes

Methods (code)

Biochemical Analysis (BCA)1421.21%
Complete Genome Sequencing (CS)34.55%
Feulgen Densitometry (FD)1624.24%
Flow Cytometry (FCM)2030.30%
Not Specified (NS)11.52%
Static Cell Fluorometry (SCF)1218.18%

Cell Types (code)

Not specified (NS)23.03%
Sperm (S)1421.21%
Testes (TS)23.03%
Ventral hypodermal chord (VHC)1218.18%
Whole body (WB)3654.55%

Standard Species (code, C-value)

Caenorhabditis elegans (CE, 0.10pg)3148.44%
Gallus domesticus (GD, 1.25pg)34.69%
Meloidogyne incognita (MI, 0.05pg)1218.75%
Not specified1828.13%