Genome size of Biomphalaria glabrata

The haploid genome size or C-value of Biomphalaria glabrata
is estimated at 0.95pg (± 0.01 SE).
This converts (C-value x 0.98 x109) to 931Mbases.

Literature reference
Gregory, T.R. (2003).  Genome size estimates for two important freshwater molluscs, the zebra mussel (Dreissena polymorpha) and the schistosomiasis vector snail (Biomphalaria glabrata). Genome 46: 841-844 (abstract)

This value is based on analysis of hemocyte samples from three different strains (M-line, 13-16R1 and BS90) of Biomphalaria glabrata. Integrated optical density (IOD) measurements were taken from 25 Feulgen-stained nuclei of hemocytes of individual snails (n = 14, total of 350 nuclei), and compared against >100 chicken erythrocyte nuclei (1C = 1.25pg), using an image analysis system. There was no difference in IODs between the washed and unwashed hemocyte samples, and variation among individuals, including among strains was minimal.

Feulgen-staining and measurement of the C-value were kindly performed (March 2002) by
                    T. Ryan Gregory,
                    Department of Zoology, University of Guelph, 
                    Guelph, Ontario, Canada, N1G 2W1.
For more information, including preparation and submission of samples, see

Hemocyte samples were prepared using Biomphalaria glabrata strains available at the University of New Mexico by Coen M. Adema.