Myxosporeans infecting the gills of bigmouth buffalo (Ictiobus bubalus) in Illinois, USA.

Four myxosporean species were found on the gills of Ictiobus bubalus from Illinois (USA). Myxobolus endovasus (Davis, 1947) Grinham et Cone, 1990 is revised. Three new species are recorded. Myxobolus enoblei sp. n. has spores ovoid in frontal view, 14.3 x 13 microns in size. Myxobolus morrisonae sp. n. has spores subcircular in frontal view, 10 x 9.5 microns in size; the surface of shell valves appears hairy when studied by SEM. Triangula illinoisensis sp. n. has spores rounded semicircular in frontal view, 10.2 x 12.8 microns in size. Triangula illinoisensis is the fourth species of its genus to be described from fishes.