Contrary to the reports of several authors, Acomus generosus, a sucker of the subgenus Pantosteus of Catostomus, may have been collected in Big Cottonwood Creek or Little Cottonwood Creek, Salt Lake County, Utah, and possibly in Provo River, Utah County, Utah. Multiple Pantosteus species may exist in Provo River. Synonymies of the suckers that have been collected in Provo River and ?Cottonwood Creek? are provided. A comparison of their morphologies shows several distinctions. There is a need for further systematic (including up-to-date biochemical) analyses of these catostomids. Published in American Midland Naturalist, volume 143, issue 2, on pages 422 - 432, in 2000.
