Catostomus is a genus of fish belonging to the family Catostomidae, commonly known as suckers. This genus of fish usually lives in freshwater basins. Most members of the genus are native to North America, but C. catostomus is also found in Russia. A majority of species inhabit western North America, with only C. catostomus, C. commersonii, and C. utawana being found in eastern North America.

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