The Banff longnose dace, Rhinichthys cataractae smithi, was a diminutive (about five cm. long) version of the eastern longnose dace, its range restricted to a small marsh fed by two hot springs on Sulphur Mountain in Banff National Park in Banff, Alberta.
The Grass Valley speckled dace (Rhinichthys osculus reliquus) occurred in a single spring-fed creek in a grassy meadow in eastern Lander County, Nevada.