2963 Pantosteus clarkii (Baird & Girard, 1854) Catostomidae Suckers Catostominae Cypriniformes Teleostei Desert sucker North America: lower Colorado River drainage including Pluvial White River and Meadow Valley Wash in Nevada, USA; Virgin River in Utah, Arizona and Nevada, USA; Bill Williams River in Arizona, USA; and Gila River in New Mexico and Arizona, USA and in northern Sonora, Mexico.