edaphoceras is a genus of koninckioceratid nautilids from the mississippian of north america, named by hyatt, 1884, with depressed whorls just in contact. the shell, as typical for the family, is evolute; whorl section is fusiform with broadly rounded venter and dorsum meeting at a narrow angle on either side. its suture has a distinct ventral and dorsal lobe and an angular lateral saddle. the siphuncle is small and near central.