T. Ryan Gregory, Paul D.N. Hebert, and Jurek Kolasa
Heredity 84(2): 201-208.
Summary
Genome and body sizes were measured in 38 species
of turbellarian flatworms and 16 species of copepod crustaceans.
Significant positive relationships existed between genome size and body
size in both groups. The slopes of these regressions indicated
that
increases in cell volume are reinforced by increased cell numbers, or
that
cell volumes show positive allometric variation with genome size.
Genome sizes appear to vary in a discontinuous fashion among congeneric
species in both groups, indicating that such changes have occurred
rapidly,
and with potentially profound effects on important morphological
characters.