Criconematid Project
Criconematids from the Nearctic Ecoregions

EcoRegion: Central U.S. Hardwood forests
Collection Site

Fern Clyffe State Park,
Union county, Illinois

Ecoregions map after "Terrestrial Ecoregions of North America: A Conservation Assessment." 
Ricketts, T.H., E. Dinerstein, D.M. Olson, C.J. Loucks, et al.  (1999) World Wildlife Fund - United States and Canada.  Island Press, Washington, D.C.
as appearing on Bioimages website-