Grass Valley speckled dace

The Grass Valley speckled dace (Rhinichthys osculus reliquus) occurred in a single spring-fed creek in a grassy meadow in eastern Lander County, Nevada. Specimens were collected only once, in 1938 and it was then common. The species had a distinctive speckled lower lip and silver sided body. The introduction of brook and rainbow trout to the creek is believed to be the reason for their extinction.