This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
Corresponding author (Name, Year)
Ref.: M.L. Thein and M.H. Nitecki. 1974. Chesterian (Upper Mississippian) Gastropoda of the Illinois basin. Fieldiana: Geology, New Series 34:1-238