Mississippi River Basin
Missouri DOC
Radix auricularia
Cipangopaludina japonica
Melanoides tuberulatus
Cipangopaludina chinensis
Dan Gustafson
Potamopyrgus antipodarum
Melanoides in Montana and Colorado. Radix (Asian) in the Platte and upper Arkansas in CO.  Japonica reported from Oklahoma and Nebraska. Chinensis reported from the Miss Basin from IL, IN, IA, MN, WI.  The New Zealand mudsnail is in the headwaters of the Missouri R in MT.  I might assume that these species are all well established in order to be detected and are probably more widespread than reported.